Complete ENT (Otorhinolaryngology) question bank — ear, nose, throat, larynx, airway & head-neck — in explanation-first exam-topper style, with 72 diagrams.
12chapters144questions77High-Yield
THE CONCEPT
Tonsillitis is inflammation of the palatine tonsils (part of Waldeyer's ring). It is acute (usually viral or bacterial) or chronic (recurrent/persistent inflammation).
The palatine tonsil in the oral cavity
tonsil
uvula
anterior pillar
posterior pillar
tongue
Tonsil sits in its fossa between the palatoglossal (anterior) & palatopharyngeal (posterior) pillars
The palatine tonsil lies in the tonsillar fossa between the palatoglossal (anterior) and palatopharyngeal (posterior) pillars, with the uvula in the midline and the tongue below. Its crypts trap debris and are the seat of follicular tonsillitis.
ACUTE TONSILLITIS — AETIOLOGY & FEATURES
It is caused by a virus (commonest — adenovirus, rhinovirus, EBV) or bacteria — Group A beta-haemolytic Streptococcus (S. pyogenes), the important treatable one. Morphological types are catarrhal, follicular (pus in crypts — white spots), parenchymatous and membranous. Features are:
Sore throat, odynophagia (painful swallowing), dysphagia, fever, malaise and referred otalgia (via the glossopharyngeal nerve).
Examination: red, swollen tonsils with follicular exudate, enlarged tender jugulodigastric (tonsillar) lymph nodes and foul breath.
The Centor criteria (fever, tonsillar exudate, tender anterior cervical nodes, absence of cough) help predict a streptococcal cause.
MANAGEMENT & COMPLICATIONS
Management is supportive (analgesia, hydration, rest, saline gargles) plus penicillin (or amoxicillin) for 10 days if bacterial/streptococcal — to prevent rheumatic fever — avoiding amoxicillin/ampicillin if EBV (glandular fever) is suspected (it causes a rash).
WHY IT MATTERS TO IDENTIFY STREPTOCOCCAL TONSILLITIS
The most important clinical judgement in acute tonsillitis is distinguishing the common, self-limiting viral illness from streptococcal tonsillitis, because only the latter needs antibiotics — and for good reason. Group A streptococcal infection, if untreated, can lead to the immune-mediated complications of rheumatic fever and post-streptococcal glomerulonephritis, as well as to suppurative spread (quinsy). Because viral and bacterial tonsillitis look similar, clinical prediction tools such as the Centor criteria (fever, tonsillar exudate, tender anterior cervical nodes and the absence of cough) are used to estimate the likelihood of a streptococcal cause and hence the value of antibiotics. Getting this right avoids two errors: withholding antibiotics from a genuine streptococcal infection (risking rheumatic fever), and prescribing them needlessly for a viral sore throat (driving resistance and side-effects). This is why so much emphasis is placed on recognising the streptococcal picture.
WHY AMOXICILLIN IS AVOIDED IN GLANDULAR FEVER
A frequently-tested and clinically important pitfall is that amoxicillin (and ampicillin) must be avoided when infectious mononucleosis (glandular fever, EBV) is a possibility. A patient with a severe membranous tonsillitis, marked lymphadenopathy and malaise may have EBV rather than streptococcal infection, and if given amoxicillin will characteristically develop a widespread maculopapular rash — not a true penicillin allergy, but a well-recognised reaction to aminopenicillins in the setting of EBV. This is why penicillin V (phenoxymethylpenicillin), rather than amoxicillin, is the preferred antibiotic for a sore throat when the cause is uncertain, and why glandular fever should be considered (and tested for with a Paul-Bunnell/monospot and blood film) in an adolescent or young adult with a prolonged, severe, membranous tonsillitis. Recognising this avoids both an alarming rash and the mistaken labelling of the patient as penicillin-allergic.
THE BOTTOM LINE
Tonsillitis is inflammation of the palatine tonsils, most often viral but sometimes streptococcal, where identifying and treating the streptococcal cases with penicillin prevents rheumatic fever, while avoiding amoxicillin guards against the glandular-fever rash and recurrent disease points toward tonsillectomy.
⚠️
DANGER / REMEMBER: Complications are local (peritonsillar abscess/quinsy, parapharyngeal/retropharyngeal abscess, otitis media) and systemic from Group A Strep (rheumatic fever, post-streptococcal glomerulonephritis, scarlet fever). Chronic tonsillitis gives recurrent sore throats, halitosis, tonsillar debris/crypts (tonsilliths) and persistently enlarged tonsils — and may warrant tonsillectomy.
💡
CLINICAL PEARL: Tonsillitis = inflammation of the palatine tonsils; acute is viral (commonest) or bacterial (Group A Strep — treat to prevent rheumatic fever), with sore throat, odynophagia, fever, referred otalgia, follicular exudate and tender jugulodigastric nodes. Centor criteria predict Strep. Treat with supportive care + penicillin (10 days) if bacterial (avoid amoxicillin in EBV — rash). Complications: quinsy, deep-space abscess; GAS → rheumatic fever/GN. Chronic/recurrent → tonsillectomy.
💊
KEY POINTS / NUMBERS (viva)
Tonsillitis = inflammation of palatine tonsils; acute viral (adenovirus/rhinovirus/EBV — commonest) or bacterial (Group A beta-haemolytic Strep, S. pyogenes).
Sore throat, odynophagia, dysphagia, fever, referred otalgia (IX); red swollen tonsils + follicular exudate, tender jugulodigastric nodes. Centor criteria (fever, exudate, tender anterior nodes, no cough) predict GAS.
Rx: supportive (analgesia, hydration, saline gargles) + penicillin/amoxicillin 10 days if bacterial (prevent rheumatic fever); AVOID amoxicillin/ampicillin in EBV (rash). Complications: quinsy, parapharyngeal/retropharyngeal abscess, OM; GAS → rheumatic fever, post-strep GN, scarlet fever. Chronic → tonsillectomy.
🔑
KEY POINTS TO REMEMBER
Tonsillitis = inflammation of the palatine tonsils; acute is viral (commonest) or bacterial (Group A Strep — the treatable one).
Chronic tonsillitis (recurrent sore throats, halitosis, tonsilliths) may need tonsillectomy.
📚
SOURCES: Dhingra — Diseases of Ear, Nose and Throat; Scott-Brown's Otorhinolaryngology.
THE CONCEPT
Tonsillectomy is the surgical removal of the palatine tonsils — one of the commonest ENT operations — performed for specific indications (recurrent infection, obstruction, or suspicion of malignancy).
INDICATIONS
Absolute: obstructive sleep apnoea/airway obstruction (especially in children, with the adenoids), suspected malignancy (unilateral enlargement/ulcer — for biopsy), and recurrent quinsy.
Relative: recurrent acute tonsillitis (by the SIGN/Paradise criteria — e.g. ≥7 episodes in 1 year, ≥5/year for 2 years, or ≥3/year for 3 years), chronic tonsillitis, tonsillar stones/halitosis, and a diphtheria carrier state.
TECHNIQUE & CONTRAINDICATIONS
It is done under general anaesthesia by an oral approach — dissection (cold-steel dissection and snare) or diathermy/coblation/laser — removing the tonsil from its capsule/bed and securing haemostasis. Relative contraindications are bleeding disorders, active acute infection (operate once settled), a cleft palate and anaemia.
COMPLICATIONS
WHY STRICT CRITERIA GOVERN THE OPERATION
An important principle is that, although tonsillectomy is common, it is performed only for well-defined indications rather than for every sore throat, and understanding why explains the strict criteria. Recurrent tonsillitis often improves naturally as a child grows, and the operation itself carries real risks — above all haemorrhage — and the discomfort of a painful recovery. To ensure the benefit outweighs these risks, guidelines such as the Paradise/SIGN criteria set a threshold of frequency and severity of documented episodes (for example, around seven well-documented attacks in a year) before recommending surgery for recurrent tonsillitis. Obstructive indications (sleep apnoea) and the suspicion of malignancy (a unilateral enlarging tonsil) are treated more readily because the stakes are higher. This disciplined, criteria-based approach prevents both the over-use of an operation that many children would outgrow and the under-treatment of those genuinely disabled by recurrent infection or obstruction.
WHY THE TWO TYPES OF BLEED DIFFER
The distinction between primary (reactionary) and secondary post-tonsillectomy haemorrhage is a classic examination point, and it reflects two different underlying causes occurring at different times. Primary (reactionary) haemorrhage occurs within the first 24 hours — during or shortly after surgery — and results from inadequate surgical haemostasis (a slipped ligature or a vessel that opens as the anaesthetic wears off and blood pressure recovers). Secondary haemorrhage occurs typically around 5–10 days later, when the fibrinous slough covering the healing tonsil bed separates, usually precipitated by infection. Recognising which type is occurring matters because the timing points to the cause and guides management: an early bleed may need a return to theatre to secure the vessel, whereas a later, infection-related bleed is often managed with antibiotics, resuscitation and local measures, though a significant bleed at any time can be dangerous and may require surgical control. Any post-tonsillectomy bleed is taken seriously because of the risk of airway compromise and significant blood loss.
THE BOTTOM LINE
Tonsillectomy is a common but criteria-governed operation for recurrent tonsillitis, obstruction or suspected malignancy, whose principal hazard is haemorrhage — reactionary within 24 hours or secondary at 5–10 days — both taken seriously because of the airway and blood-loss risks.
A NOTE ON POST-OPERATIVE CARE
Because pain and the risk of bleeding dominate the recovery, post-operative care is directed at both. Patients are encouraged to eat normally and stay well hydrated — counter-intuitively, a normal diet keeps the tonsil bed clean and reduces infection, which lessens the chance of secondary haemorrhage — and are given regular analgesia, since a painful throat that discourages eating and drinking can lead to dehydration and a dirty, infected bed. They and their families are warned that any bleeding from the mouth, however small, must be reported at once, as a small 'herald' bleed can precede a major one. This emphasis on adequate analgesia, oral intake and prompt reporting of bleeding reflects the two main problems of the recovery period and is an important part of counselling before the child goes home.
⚠️
DANGER / REMEMBER: The key complications are haemorrhage: primary (reactionary) haemorrhage within 24 hours (the commonest — from a slipped ligature/incomplete haemostasis) and secondary haemorrhage at 5–10 days (from infection/sloughing of the healing bed); also pain, referred otalgia, infection and anaesthetic risks. A post-tonsillectomy bleed is managed by resuscitation, removing clot, pressure/adrenaline packing, and returning to theatre if severe.
💡
CLINICAL PEARL: Tonsillectomy = removal of the palatine tonsils. Indications: OSA/obstruction (esp children), recurrent tonsillitis (Paradise criteria — ~≥7/year, or 5/year ×2, or 3/year ×3), recurrent quinsy, and suspected malignancy (unilateral)/biopsy. Technique: GA, cold-steel dissection or coblation/diathermy. Key complications: primary (reactionary) haemorrhage (<24 h) and secondary haemorrhage (5–10 days, infection). Manage a bleed: resuscitate + remove clot + pack/adrenaline; theatre if severe.
💊
KEY POINTS / NUMBERS (viva)
Tonsillectomy indications — absolute: OSA/obstruction (esp children + adenoids), suspected malignancy (unilateral — biopsy), recurrent quinsy. Relative: recurrent tonsillitis (Paradise/SIGN — ≥7 in 1 y, ≥5/y ×2 y, ≥3/y ×3 y), chronic tonsillitis, tonsilliths/halitosis, diphtheria carrier.
Relative: recurrent tonsillitis (Paradise criteria — ~≥7/yr, or 5/yr×2, or 3/yr×3), chronic tonsillitis, tonsilliths/halitosis.
Technique: GA, cold-steel dissection or coblation/diathermy; haemostasis.
Complications: primary (reactionary) haemorrhage <24 h (commonest); secondary haemorrhage 5–10 days (infection). Bleed → resuscitate, remove clot, pack, theatre if severe.
📚
SOURCES: Dhingra — Diseases of Ear, Nose and Throat; SIGN guidelines.
THE CONCEPT
The adenoids are the nasopharyngeal tonsil — lymphoid tissue at the roof/posterior wall of the nasopharynx, part of Waldeyer's ring. They physiologically enlarge in childhood (peak 3–7 years) then regress; pathological enlargement causes nasal obstruction and its sequelae.
Adenoid facies
long face
pinched narrow nose
open mouth(mouth breathing)
nasopharynx
enlarged adenoid blocks airway
Chronic mouth breathing → long face, open mouth, high-arched palate, dull expression
Adenoid facies: chronic nasal obstruction from an enlarged adenoid forces mouth breathing, producing the characteristic long face, open mouth, pinched nose, high-arched palate and dull expression, while the adenoid blocks the nasopharyngeal airway (and often the Eustachian tube).
CLINICAL FEATURES OF HYPERTROPHY
Nasal obstruction → mouth breathing, snoring, a hyponasal (rhinolalia clausa) voice and nasal discharge.
Adenoid facies — chronic mouth breathing → an open mouth, elongated face, pinched nose, high-arched palate, prominent upper incisors and a dull expression.
Eustachian-tube obstruction → otitis media with effusion (glue ear) → conductive hearing loss (and recurrent otitis media).
Sleep-disordered breathing/OSA, sinusitis, poor feeding and failure to thrive.
DIAGNOSIS & MANAGEMENT
Diagnosis is by history, posterior rhinoscopy/nasal endoscopy, a lateral neck X-ray (adenoid shadow) and assessment for OME (tympanometry). Management is conservative for mild disease (treat infection/allergy, nasal steroids) and adenoidectomy for significant obstruction, OSA, recurrent/chronic OME (with grommets) or recurrent sinusitis/adenoiditis — often combined with tonsillectomy and/or grommet insertion.
💡
CLINICAL PEARL: Adenoids = the nasopharyngeal tonsil (Waldeyer's ring); they enlarge in childhood (3–7 years) then regress. Hypertrophy → nasal obstruction (mouth breathing, snoring, hyponasal voice), adenoid facies (open mouth, long face, high-arched palate), Eustachian block → OME/glue ear/conductive loss, OSA and sinusitis. Diagnose with endoscopy and a lateral neck X-ray. Treat with nasal steroids (mild) or adenoidectomy for obstruction/OSA/recurrent OME (± grommets/tonsillectomy).
WHY ADENOID ENLARGEMENT CAUSES SUCH VARIED PROBLEMS
It is worth appreciating why an enlarged adenoid — a small mass of lymphoid tissue at the back of the nose — produces such a wide range of problems, because it explains the whole clinical picture. Sitting at the junction of the nose, the nasopharynx and the Eustachian tubes, an enlarged adenoid obstructs several structures at once. It blocks the posterior nasal airway, forcing chronic mouth breathing that, over years of a child's facial growth, moulds the characteristic adenoid facies. It obstructs the Eustachian-tube openings, impairing middle-ear ventilation and causing recurrent otitis media and glue ear with conductive hearing loss — which can in turn delay speech and learning. And it narrows the upper airway during sleep, contributing to snoring and obstructive sleep apnoea. Understanding that a single enlarged structure simultaneously affects breathing, hearing and sleep explains why adenoidectomy can improve so many apparently unrelated childhood complaints.
WHY TIMING AND NATURAL REGRESSION MATTER
A useful concept in managing adenoids is that their natural history — physiological enlargement in early childhood followed by spontaneous regression — shapes the decision to operate. Because the adenoid tissue normally grows to its largest around 3–7 years of age and then shrinks as the child grows, many children with mild symptoms can be managed conservatively in the expectation that the problem will settle with time and simple measures such as treating coexisting allergy. Surgery is reserved for those with significant, persistent effects — troublesome obstruction, sleep apnoea or recurrent glue ear — that cannot wait for natural regression or that risk lasting consequences (such as impaired hearing and speech development during a critical period). Weighing the expected natural improvement against the severity and consequences of the current symptoms is therefore central to deciding when adenoidectomy is justified.
THE BOTTOM LINE
Adenoid hypertrophy is a childhood condition in which enlarged nasopharyngeal lymphoid tissue simultaneously obstructs the nose, the Eustachian tubes and the sleeping airway, producing adenoid facies, glue ear and sleep apnoea, and is relieved by adenoidectomy when symptoms are significant.
A NOTE ON THE LINK WITH GLUE EAR
The connection between adenoid hypertrophy and otitis media with effusion (glue ear) deserves emphasis because it is one of the commonest reasons for surgery. The enlarged adenoid obstructs the nasopharyngeal openings of the Eustachian tubes and acts as a reservoir of infection, impairing the ventilation and drainage of the middle ear. The result is a persistent middle-ear effusion that muffles hearing during the very years a child is developing speech and language. This is why adenoidectomy is often combined with the insertion of grommets (ventilation tubes) for recurrent or persistent glue ear: removing the adenoid addresses the underlying obstruction and infection reservoir, while the grommet ventilates the ear directly. Recognising that a child's inattentiveness or delayed speech may stem from adenoid-related glue ear — rather than a primary hearing or behavioural problem — can lead to a simple and effective remedy.
💊
KEY POINTS / NUMBERS (viva)
Adenoids = nasopharyngeal tonsil (roof/posterior nasopharynx; Waldeyer's ring); physiological enlargement peaks 3–7 y then regresses.
Adenoid facies: open mouth, long face, pinched nose, high-arched palate, dull expression.
Eustachian obstruction → OME/glue ear → conductive hearing loss; also OSA, sinusitis, failure to thrive.
Diagnose (endoscopy, lateral neck X-ray); treat with nasal steroids (mild) or adenoidectomy (obstruction/OSA/recurrent OME, ± grommets/tonsillectomy).
📚
SOURCES: Dhingra — Diseases of Ear, Nose and Throat.
THE CONCEPT
A peritonsillar abscess (quinsy) is a collection of pus in the peritonsillar space (between the tonsil capsule and the superior constrictor muscle), usually a complication of acute tonsillitis — the commonest deep-space abscess of the throat.
Peritonsillar abscess (quinsy)
pus
swollen soft palate,tonsil pushed down & medially
uvula deviated tothe OPPOSITE side
Unilateral · trismus · 'hot-potato' muffled voice · drooling
Peritonsillar abscess (quinsy): pus collects between the tonsil capsule and the superior constrictor, bulging the soft palate, pushing the tonsil down and medially, and deviating the uvula to the opposite side — with trismus, a muffled 'hot-potato' voice and drooling.
PATHOGENESIS & FEATURES
Acute tonsillitis spreads through the tonsil capsule into the peritonsillar space → cellulitis → abscess (usually at the superior pole); it is polymicrobial (streptococci, anaerobes). It is usually unilateral, in young adults:
Severe, worsening unilateral sore throat and odynophagia, with fever and malaise.
Trismus (difficulty opening the mouth — pterygoid irritation).
A 'hot-potato'/muffled voice, drooling (unable to swallow saliva), foul breath and referred otalgia.
Examination: swelling of the soft palate/peritonsillar region, the tonsil pushed down and medially, and the uvula deviated to the opposite side.
MANAGEMENT & COMPLICATIONS
WHY THE UVULA DEVIATES AND TRISMUS OCCURS
The characteristic signs of quinsy become easy to remember once the underlying anatomy is understood. The abscess forms in the peritonsillar space, typically at the upper pole of the tonsil, between the tonsil capsule and the superior constrictor muscle. As pus accumulates on one side, it pushes the tonsil downward and toward the midline and bulges the soft palate, which in turn displaces the uvula across to the opposite (unaffected) side — the classic asymmetry of a quinsy. The trismus (inability to open the mouth fully) arises because the inflammation irritates the nearby pterygoid muscles, and the muffled 'hot-potato' voice and drooling reflect the painful swelling in the throat preventing normal speech and swallowing of saliva. Recognising that all these signs flow from a one-sided collection of pus in a confined space around the tonsil makes the diagnosis straightforward at the bedside.
WHY DRAINAGE IS ESSENTIAL
A key management principle is that a quinsy, being an abscess (a collection of pus), requires drainage — antibiotics alone are usually insufficient. Once pus has formed within the peritonsillar space, antibiotics cannot readily penetrate and clear it, so the pus must be physically removed by needle aspiration or by incision and drainage at the point of maximal bulge, which brings rapid relief. Antibiotics (typically penicillin with metronidazole to cover anaerobes), fluids and analgesia are important adjuncts, but the drainage is the decisive step. This is a specific instance of the general surgical rule that an abscess needs drainage, and it explains why a patient with a suspected quinsy is not simply sent home on antibiotics but has the collection drained — with consideration of an interval tonsillectomy later if quinsies recur.
THE BOTTOM LINE
Quinsy is a peritonsillar abscess complicating tonsillitis, recognised by unilateral throat pain, trismus, a muffled voice and a uvula deviated to the opposite side, and treated by drainage of the pus alongside antibiotics.
⚠️
DANGER / REMEMBER: Management is ABC, analgesia, IV fluids and IV antibiotics (penicillin + metronidazole for anaerobes), plus drainage (the key) by needle aspiration or incision and drainage at the point of maximal bulge, with steroids to reduce oedema; an interval (or 'quinsy') tonsillectomy is considered for recurrence. Complications include parapharyngeal abscess, airway obstruction, aspiration, deep-neck/mediastinal spread and Lemierre's syndrome.
💡
CLINICAL PEARL: Quinsy (peritonsillar abscess) = pus between the tonsil capsule and the superior constrictor, complicating tonsillitis. It gives a unilateral severe sore throat + trismus + a 'hot-potato' muffled voice + drooling, with the tonsil pushed medially and the uvula deviated to the opposite side. Treat with IV antibiotics (penicillin + metronidazole) + drainage (aspiration/incision) + analgesia/fluids/steroids; interval tonsillectomy for recurrence. Complications: parapharyngeal/deep-neck spread, airway obstruction.
💊
KEY POINTS / NUMBERS (viva)
Quinsy = peritonsillar abscess (pus between tonsil capsule & superior constrictor), usually complicating acute tonsillitis; polymicrobial (streptococci + anaerobes); young adults, unilateral.
Unilateral severe sore throat + trismus + 'hot-potato'/muffled voice + drooling + referred otalgia; tonsil pushed down & medially, UVULA deviated to the OPPOSITE side, tender nodes.
Rx: IV antibiotics (penicillin + metronidazole) + DRAINAGE (needle aspiration or incision & drainage at maximal bulge) + analgesia/IV fluids/steroids; interval/quinsy tonsillectomy for recurrence. Complications: parapharyngeal abscess, airway obstruction, aspiration, mediastinitis, Lemierre's syndrome.
🔑
KEY POINTS TO REMEMBER
Quinsy = peritonsillar abscess (pus between the tonsil capsule and superior constrictor), complicating tonsillitis.
Unilateral severe sore throat + trismus + 'hot-potato' muffled voice + drooling; young adults.
Tonsil pushed down and medially; uvula deviated to the OPPOSITE side; soft-palate swelling.
Interval tonsillectomy for recurrence; complications — parapharyngeal/deep-neck spread, airway obstruction.
📚
SOURCES: Dhingra — Diseases of Ear, Nose and Throat; Scott-Brown's Otorhinolaryngology.
THE CONCEPT
Nasopharyngeal carcinoma (NPC) is a malignant tumour of the nasopharyngeal epithelium, arising especially in the fossa of Rosenmüller (the lateral pharyngeal recess). It has a distinct epidemiology (Southern China, SE Asia) and is Epstein-Barr virus (EBV)-associated.
Nasopharyngeal carcinoma
nasal cavity
oropharynx
tumour — fossaof Rosenmüller
Eustachian tube → OME
skull base / cranial nerves
neck node (commonest 1st sign)
EBV-associated · unilateral serous otitis media in an adult → suspect NPC · Trotter's triad
Nasopharyngeal carcinoma arises in the fossa of Rosenmüller and spreads insidiously: forward causing nasal obstruction/epistaxis, laterally blocking the Eustachian tube (a unilateral serous otitis media in an adult), upward to the skull base and cranial nerves, and — most commonly presenting — to the neck nodes. It is EBV-associated.
AETIOLOGY & HISTOLOGY
It is strongly associated with EBV, a genetic predisposition (Southern Chinese/endemic areas) and dietary factors (salted fish/nitrosamines). WHO histological types are keratinizing SCC and non-keratinizing (differentiated/undifferentiated); the undifferentiated type is EBV-related, commonest in endemic areas and radiosensitive.
CLINICAL FEATURES (often late)
A neck mass (cervical lymphadenopathy) — often the first and commonest presentation (upper deep cervical/posterior triangle).
Otologic: a unilateral conductive hearing loss/OME (Eustachian-tube obstruction) — a unilateral serous otitis media in an adult should raise the suspicion of NPC.
Diagnosis is by nasopharyngoscopy and biopsy (of the mass in the fossa of Rosenmüller), MRI/CT (extent), EBV serology/DNA and node assessment. Radiotherapy is the mainstay (radiosensitive, especially the undifferentiated type), with chemotherapy (chemoradiation) for advanced disease; surgery is limited (the nasopharynx is inaccessible — reserved for residual/recurrent disease and neck dissection for nodes).
💡
CLINICAL PEARL: Nasopharyngeal carcinoma = malignancy of the nasopharyngeal epithelium (fossa of Rosenmüller); EBV-associated, endemic in Southern China/SE Asia, undifferentiated type radiosensitive. Presents late: a neck mass (commonest first sign) + a unilateral serous otitis media (OME) in an adult (Eustachian block) + nasal obstruction/epistaxis + cranial-nerve palsies (Trotter's triad = conductive deafness + trigeminal neuralgia + palatal palsy). Diagnose with nasopharyngoscopy + biopsy, MRI and EBV. Treat with radiotherapy (mainstay) ± chemotherapy.
WHY IT PRESENTS SO LATE AND SO DECEPTIVELY
A defining and dangerous feature of nasopharyngeal carcinoma is that it presents late and with deceptive, seemingly unrelated symptoms, and understanding why is crucial to catching it early. The tumour arises hidden in the fossa of Rosenmüller, out of sight at the back of the nose, so it produces no early local symptoms and grows silently. Its first manifestations are therefore often indirect: a neck lump from early lymph-node spread (the commonest presentation), or a one-sided glue ear from the tumour blocking the Eustachian tube. This is why the classic teaching is that a unilateral serous otitis media in an adult must be regarded as nasopharyngeal carcinoma until proven otherwise — an apparently trivial ear complaint that is actually the first clue to a hidden cancer. Recognising that NPC hides anatomically and presents through its effects on adjacent structures is the key to not missing it.
WHY RADIOTHERAPY IS THE MAINSTAY
Unlike most head-and-neck cancers, nasopharyngeal carcinoma is treated primarily by radiotherapy rather than surgery, and understanding why clarifies its management. Two factors drive this. First, the nasopharynx is anatomically inaccessible, surrounded by the skull base and critical structures, making surgical removal of the primary tumour extremely difficult and morbid. Second, the common undifferentiated (EBV-associated) type is highly radiosensitive, responding well to radiation. Together these make radiotherapy (with chemotherapy added for advanced disease) the treatment of choice for the primary tumour and the neck nodes, with surgery reserved for residual or recurrent disease and for neck dissection. This is a good illustration of how the choice of cancer treatment depends both on the accessibility of the tumour and on its intrinsic sensitivity to radiation — and it explains why the management of NPC differs so markedly from that of most other pharyngeal cancers.
💊
KEY POINTS / NUMBERS (viva)
Nasopharyngeal carcinoma = malignancy of nasopharyngeal epithelium (fossa of Rosenmüller); EBV-associated; endemic Southern China/SE Asia; salted fish/nitrosamines, genetic.
WHO: keratinizing SCC vs non-keratinizing (differentiated/undifferentiated — EBV-related, radiosensitive). Presents late: neck mass (commonest 1st sign), nasal obstruction/epistaxis, unilateral serous otitis media (OME) in an adult (→ suspect NPC), cranial-nerve palsies.
SOURCES: Dhingra — Diseases of Ear, Nose and Throat; Scott-Brown's Otorhinolaryngology.
THE CONCEPT
Waldeyer's ring is a ring of lymphoid tissue guarding the entrance to the aerodigestive tract at the pharynx, providing immune surveillance of inhaled/ingested antigens.
Waldeyer's ring
nasopharyngeal tonsil (adenoid)
tubal tonsil
palatine tonsil
lingual tonsil
A ring of lymphoid tissue (MALT) guarding the entrance to the aerodigestive tract
Waldeyer's ring: a ring of lymphoid tissue guarding the aerodigestive entrance — the nasopharyngeal tonsil (adenoid) above, the tubal tonsils around the Eustachian openings, the palatine tonsils on each side, and the lingual tonsil at the tongue base.
COMPONENTS & FUNCTION
Nasopharyngeal tonsil (adenoids) — superiorly, at the roof of the nasopharynx.
Tubal tonsils — around the Eustachian-tube openings.
Palatine tonsils — in the tonsillar fossae (oropharynx).
Lingual tonsil — at the base of the tongue; plus scattered lymphoid nodules on the posterior pharyngeal wall.
It is part of the mucosa-associated lymphoid tissue (MALT), most active in childhood (hence childhood tonsil/adenoid enlargement) and involuting with age; clinically it is the seat of infection (tonsillitis, adenoiditis) and lymphoma.
A NOTE ON ITS CLINICAL IMPORTANCE
The clinical value of understanding Waldeyer's ring is that it ties together several common ENT conditions as diseases of the same lymphoid tissue at different sites. Tonsillitis, adenoid hypertrophy and lingual-tonsil infection are all disorders of components of this one ring, and its marked activity and enlargement in childhood explains why tonsil and adenoid problems are so characteristically childhood conditions that often improve with age as the tissue involutes. The ring's position guarding the aerodigestive entrance also explains why it is a frequent site of infection and, importantly, a site where lymphoma can arise — so an asymmetrically enlarged tonsil in an adult raises the possibility of lymphoma or carcinoma. Seeing the tonsils and adenoids as parts of a single functional immunological ring, rather than isolated structures, gives a unifying framework for much of pharyngeal disease.
THE BOTTOM LINE
Waldeyer's ring is the lymphoid ring (adenoid, tubal, palatine and lingual tonsils) guarding the aerodigestive entrance — the common seat of childhood tonsil/adenoid disease and, in adults, of lymphoma.
A further point worth remembering is that, because the tonsils and adenoids are immunological tissue, their removal in childhood does not leave the child immunodeficient — the rest of the immune system, including the other components of the ring and the wider lymphoid tissue, more than compensates — which is an important reassurance to give parents worried that tonsillectomy or adenoidectomy will harm their child's defences.
It is also worth noting that the tonsils and adenoids, being readily visible or accessible parts of the immune system, serve as useful indicators of systemic conditions — markedly enlarged, symmetrical tonsils can accompany infectious mononucleosis or leukaemia, for instance — so their appearance is interpreted in the context of the whole patient rather than in isolation.
🔑
KEY POINTS TO REMEMBER
Waldeyer's ring = ring of lymphoid tissue (MALT) guarding the aerodigestive entrance; immune surveillance.
Most active in childhood (childhood tonsil/adenoid enlargement); involutes with age.
Clinical: site of infection (tonsillitis, adenoiditis) and of lymphoma.
📚
SOURCES: Dhingra — Diseases of Ear, Nose and Throat.
THE CONCEPT
A retropharyngeal abscess is a collection of pus in the retropharyngeal space (between the pharynx/buccopharyngeal fascia and the prevertebral fascia).
Deep neck spaces (axial)
pharynx / airway
retropharyngeal space
parapharyngealspace
carotidsheath
vertebra
Retropharyngeal (behind pharynx) & parapharyngeal (lateral) spaces — routes of deep neck infection
The deep neck spaces: the retropharyngeal space lies behind the pharynx (in front of the prevertebral fascia) and the parapharyngeal spaces lie laterally (containing the carotid sheath). Infections in these spaces threaten the airway and can spread to the mediastinum.
TYPES & FEATURES
There are two types: acute — in young children (<5 years) from suppuration of the retropharyngeal lymph nodes following a URI/pharyngitis; and chronic — from tuberculosis of the cervical spine (a cold abscess) or tuberculous nodes. The acute type gives fever, dysphagia, drooling, a stiff neck/torticollis, a croupy cough, a bulge of the posterior pharyngeal wall (usually to one side of the midline) and airway obstruction/stridor.
DIAGNOSIS & MANAGEMENT
A NOTE ON THE TWO DISTINCT FORMS
The most important learning point is the contrast between the acute and chronic forms of retropharyngeal abscess, which differ in age, cause and behaviour. The acute abscess is a disease of young children, arising when the retropharyngeal lymph nodes (which are present in early childhood but atrophy later) suppurate after an upper-respiratory infection — hence its rarity in adults. The chronic abscess, by contrast, is typically tuberculous, arising from caries of the cervical spine as a 'cold' abscess pointing forward into the retropharyngeal space, and presents more insidiously. Recognising which form is present is essential because it changes both the likely organism and the treatment — urgent drainage and antibiotics for the acute pyogenic type, versus anti-tuberculous treatment and spinal assessment for the chronic type. Both, however, share the dangers of airway obstruction and downward spread to the mediastinum.
THE BOTTOM LINE
A retropharyngeal abscess is an acute pyogenic collection in young children or a chronic tuberculous cold abscess, both threatening the airway and the mediastinum and needing airway control, drainage and cause-directed treatment.
A further point is that, because the retropharyngeal space communicates downward with the mediastinum, an untreated or inadequately drained abscess can track into the chest to cause mediastinitis, a life-threatening complication that underlines the need for prompt recognition, imaging and drainage rather than a wait-and-see approach.
⚠️
DANGER / REMEMBER: Diagnosis is by a lateral neck X-ray (widened prevertebral soft tissue) and CT. Management is to secure the airway, give IV antibiotics, and incise and drain (transorally for the acute type — with care for the airway/aspiration), treating TB if chronic. Dangers are airway obstruction, mediastinal spread (mediastinitis) and aspiration.
🔑
KEY POINTS TO REMEMBER
Retropharyngeal abscess = pus in the retropharyngeal space (behind the pharynx, in front of the prevertebral fascia).
Acute: young children (<5 y), from suppurating retropharyngeal nodes after a URI. Chronic: TB of the cervical spine (cold abscess).
SOURCES: Dhingra — Diseases of Ear, Nose and Throat.
THE CONCEPT
Ludwig's angina is a rapidly spreading cellulitis of the submandibular space (bilaterally involving the submandibular, sublingual and submental spaces), usually of dental origin (an infected lower molar).
FEATURES
A NOTE ON WHY THE AIRWAY IS THE PRIORITY
The overriding message of Ludwig's angina is that the airway is the immediate threat to life and takes priority over everything else. Because the cellulitis involves the floor of the mouth bilaterally and pushes the tongue upward and backward, it can rapidly occlude the oral airway, and the brawny, woody swelling makes intubation difficult and distorts the anatomy. This is why management begins with securing the airway — with a low threshold for early intubation or tracheostomy before obstruction becomes critical — rather than waiting to see whether antibiotics will control the infection. Only once the airway is safe do the other essentials (intravenous antibiotics, surgical decompression and removal of the dental source) follow. Recognising Ludwig's angina as an airway emergency, in which delay can be fatal, is the single most important clinical point, and mirrors the same airway-first principle that governs all the deep neck-space infections.
THE BOTTOM LINE
Ludwig's angina is a rapidly spreading bilateral submandibular cellulitis of dental origin that is an airway emergency, managed by securing the airway, IV antibiotics, drainage and removing the dental source.
A further point is that the name 'angina' here refers to the strangling, constricting quality of the swelling rather than to cardiac pain, and that the condition is essentially a spreading cellulitis rather than a discrete abscess in its early stages, which is why surgical decompression aims to relieve tension and drain any collection rather than simply to evacuate pus.
It is also worth noting that Ludwig's angina is classically firm and 'woody' rather than fluctuant, precisely because it is a spreading cellulitis of the tissues rather than a walled-off abscess, which is why the diagnosis rests on the clinical appearance of the brawny floor-of-mouth swelling rather than on finding a pointing collection of pus.
⚠️
DANGER / REMEMBER: It produces a bilateral, firm, tender, brawny swelling of the floor of the mouth and upper neck, with the tongue pushed up and back, drooling, dysphagia, trismus and fever; the dangerous feature is airway obstruction (from tongue displacement and floor-of-mouth swelling). The organisms are mixed (streptococci, anaerobes).
MANAGEMENT
It is an emergency: secure the airway (a low threshold for intubation/tracheostomy), give IV broad-spectrum antibiotics, perform surgical decompression/drainage and extract the dental source. It can spread to the deep neck and mediastinum.
🔑
KEY POINTS TO REMEMBER
Ludwig's angina = rapidly spreading bilateral cellulitis of the submandibular space (submandibular + sublingual + submental), usually dental (lower molar).
Firm, tender, brawny floor-of-mouth/upper-neck swelling; tongue pushed up and back; drooling, dysphagia, trismus, fever.
Dangerous feature = airway obstruction (a true airway emergency).
Rx: secure the airway (low threshold for intubation/tracheostomy) + IV broad-spectrum antibiotics + surgical drainage + treat the dental source.
📚
SOURCES: Dhingra — Diseases of Ear, Nose and Throat.
THE CONCEPT
Obstructive sleep apnoea (OSA) is recurrent episodes of upper-airway obstruction (partial = hypopnoea, complete = apnoea) during sleep from collapse of the pharyngeal airway, causing intermittent hypoxia and sleep fragmentation.
RISK FACTORS & FEATURES
Risk factors are obesity, a large neck, adenotonsillar hypertrophy (the commonest cause in children), retrognathia, nasal obstruction, hypothyroidism and alcohol/sedatives. Features are loud snoring, witnessed apnoeas, daytime somnolence, morning headache and poor concentration (in children — behavioural problems, failure to thrive, enuresis). Complications include hypertension, cardiovascular disease/arrhythmia and pulmonary hypertension/cor pulmonale.
DIAGNOSIS & MANAGEMENT
Diagnosis is by polysomnography (a sleep study; the apnoea-hypopnoea index quantifies severity). Management is weight loss, sleep hygiene and avoiding alcohol/sedatives; CPAP (the mainstay for moderate-severe adults); adenotonsillectomy (first-line in children); mandibular advancement devices; and surgery (UPPP, nasal).
A NOTE ON WHY THE CAUSE DIFFERS BY AGE
A practically useful point is that the commonest cause of obstructive sleep apnoea differs between children and adults, which changes the first-line treatment. In children, adenotonsillar hypertrophy is usually responsible, so adenotonsillectomy is the first-line treatment and is often curative — removing the obstructing lymphoid tissue relieves the obstruction. In adults, obesity and pharyngeal soft-tissue crowding are the main factors, so treatment centres on weight loss and continuous positive airway pressure (CPAP), which splints the airway open during sleep, with surgery playing a lesser role. Recognising this age-related difference guides the whole approach: a snoring child with enlarged tonsils and adenoids is managed very differently from an overweight adult with daytime somnolence. It also underlines why OSA, though it presents with similar symptoms across ages, needs a cause-directed rather than a one-size-fits-all treatment.
THE BOTTOM LINE
OSA is recurrent sleep-related pharyngeal obstruction diagnosed by polysomnography, caused mainly by adenotonsillar hypertrophy in children (treated by adenotonsillectomy) and obesity in adults (treated by CPAP).
A further point is that untreated obstructive sleep apnoea has important systemic consequences beyond daytime sleepiness — sustained and nocturnal hypertension, cardiac arrhythmias and, over time, pulmonary hypertension and right heart strain — so recognising and treating it is a matter of cardiovascular and metabolic health, not merely of relieving snoring.
It is also worth noting that the diagnosis is easily overlooked because patients themselves are often unaware of their nocturnal apnoeas, which are typically reported by a bed partner, so a history of loud snoring with witnessed pauses and unrefreshing sleep should prompt a formal sleep study rather than being dismissed as simple snoring.
🔑
KEY POINTS TO REMEMBER
OSA = recurrent upper-airway obstruction in sleep from pharyngeal collapse → intermittent hypoxia + sleep fragmentation.
Risk factors: obesity, large neck, adenotonsillar hypertrophy (commonest in children), retrognathia, nasal obstruction, sedatives/alcohol.
Loud snoring, witnessed apnoeas, daytime somnolence, morning headache; children — behaviour problems, failure to thrive.
SOURCES: Dhingra — Diseases of Ear, Nose and Throat.
THE CONCEPT
Adenoidectomy is the surgical removal of the adenoids (nasopharyngeal tonsil), commonly performed in children.
INDICATIONS & TECHNIQUE
Indications are adenoid hypertrophy causing nasal obstruction/mouth breathing/OSA, recurrent/chronic otitis media with effusion (with grommets), and recurrent adenoiditis/sinusitis — often combined with tonsillectomy (adenotonsillectomy) and/or grommet insertion. Technique is under GA, transoral — curettage (adenoid curette) or suction diathermy/endoscopic — with haemostasis by packing.
COMPLICATIONS
A NOTE ON VELOPHARYNGEAL INSUFFICIENCY
The most important specific complication to understand with adenoidectomy is velopharyngeal insufficiency, because it is potentially avoidable and has lasting consequences. The adenoid sits against the posterior pharyngeal wall, and the soft palate normally closes against this region to separate the nose from the mouth during speech and swallowing. If a child has an overt or occult submucous cleft palate, removing the adenoid can unmask an inability of the palate to achieve this seal, producing hypernasal speech and nasal regurgitation of fluids. This is why the palate is examined (looking for a bifid uvula or a submucous cleft) before adenoidectomy, and why overt cleft palate is a contraindication. Awareness of this complication — and appropriate caution or modified (partial) surgery in at-risk children — prevents a distressing and difficult-to-treat speech problem, which is why it is emphasised in teaching about the operation.
THE BOTTOM LINE
Adenoidectomy relieves adenoidal obstruction, OSA and recurrent glue ear, with velopharyngeal insufficiency the key avoidable complication in children with a submucous cleft.
A further point is that adenoid tissue can regrow after curettage, particularly in very young children, so recurrence of symptoms months or years later is possible and should not be assumed to exclude previous surgery — a consideration when a child re-presents with nasal obstruction or glue ear after an earlier adenoidectomy.
It is also worth noting that adenoidectomy is frequently performed together with other procedures — with tonsillectomy for combined obstruction, or with grommet insertion for glue ear — so a single anaesthetic often addresses several related childhood ENT problems at once, which is efficient and spares the child repeated operations.
⚠️
DANGER / REMEMBER: Complications include haemorrhage, velopharyngeal insufficiency (hypernasal speech, nasal regurgitation — especially with an occult submucous cleft palate, so it is avoided in overt cleft palate), Eustachian-tube injury and recurrence (regrowth); contraindications are a cleft palate (relative — VPI risk) and bleeding disorders.
🔑
KEY POINTS TO REMEMBER
Adenoidectomy = surgical removal of the adenoids (nasopharyngeal tonsil), common in children.
Indications: adenoid hypertrophy (obstruction/mouth breathing/OSA), recurrent/chronic OME (with grommets), recurrent adenoiditis/sinusitis; often with tonsillectomy.
Technique: GA, transoral — curettage or suction diathermy/endoscopic; haemostasis by packing.
SOURCES: Dhingra — Diseases of Ear, Nose and Throat.
THE CONCEPT
A membrane or exudate over the tonsil is a classic clinical problem with an important differential diagnosis.
THE DIFFERENTIAL
Follicular tonsillitis — white spots in the crypts, removable, streptococcal.
Diphtheria — a grey-white adherent membrane that bleeds on removal, extends beyond the tonsil, with a 'bull neck' and toxaemia (Corynebacterium diphtheriae).
Candidiasis (white curdy, immunocompromised) and agranulocytosis/leukaemia (ulceration/necrosis).
KEY DISTINCTION & APPROACH
A NOTE ON WHY DIPHTHERIA MUST NOT BE MISSED
Within this differential, the one condition that must never be missed is diphtheria, because it is rapidly progressive, toxin-mediated and potentially fatal, yet treatable if recognised early. Its membrane has distinctive features — it is greyish, firmly adherent, bleeds when peeled off, and extends beyond the tonsil onto the pillars and palate — in a systemically unwell, toxaemic patient, sometimes with the characteristic 'bull neck'. Crucially, the diphtheria exotoxin can cause myocarditis and neuropathy, so treatment with antitoxin (and antibiotics) must not await bacteriological confirmation but is given on clinical suspicion. This contrasts with the easily-removable, non-adherent white spots of ordinary follicular tonsillitis. Being able to recognise the adherent, bleeding, spreading membrane of diphtheria — and to act on it immediately — is the single most important reason for learning this differential, especially in unvaccinated populations.
THE BOTTOM LINE
A membrane over the tonsil has an important differential in which diphtheria — an adherent, bleeding, spreading membrane with toxaemia — must be recognised and treated with antitoxin without delay.
A further point is that a persistent unilateral ulcer or membrane over a tonsil in an adult, especially a smoker, should also raise the suspicion of malignancy (carcinoma or lymphoma of the tonsil), so a lesion that does not resolve or fit an infective picture warrants biopsy rather than repeated courses of antibiotics.
It is also worth noting that the approach to any membrane over the tonsil is systematic: a careful history and examination, a throat swab for culture (including specific tests for diphtheria where suspected), and blood tests such as a full blood count and a Paul-Bunnell/monospot test, together allow the various causes to be distinguished and the dangerous ones identified promptly.
⚠️
DANGER / REMEMBER: The diphtheria membrane is adherent and bleeds — do not wait: give antitoxin + antibiotics. The approach is history, examination, throat swab/culture and blood tests (FBC, Paul-Bunnell/monospot).
🔑
KEY POINTS TO REMEMBER
Membrane over the tonsil differential: follicular tonsillitis (removable spots), diphtheria (adherent, bleeds, extends beyond tonsil, bull neck, toxaemia).
SOURCES: Dhingra — Diseases of Ear, Nose and Throat.
THE CONCEPT
A parapharyngeal abscess is a collection of pus in the parapharyngeal (lateral pharyngeal) space — lateral to the pharynx, medial to the pterygoid/parotid — which contains the carotid sheath and cranial nerves IX–XII.
Deep neck spaces (axial)
pharynx / airway
retropharyngeal space
parapharyngealspace
carotidsheath
vertebra
Retropharyngeal (behind pharynx) & parapharyngeal (lateral) spaces — routes of deep neck infection
The deep neck spaces: the retropharyngeal space lies behind the pharynx (in front of the prevertebral fascia) and the parapharyngeal spaces lie laterally (containing the carotid sheath). Infections in these spaces threaten the airway and can spread to the mediastinum.
SOURCES & FEATURES
Sources include tonsillitis/quinsy, dental infection, pharyngeal infection, otitis/mastoiditis (Bezold) and spread from adjacent spaces. Features are fever, sore throat, dysphagia, trismus, swelling of the lateral pharyngeal wall (pushing the tonsil medially) and an external swelling of the upper neck (behind the angle of the mandible), with torticollis.
DANGER & MANAGEMENT
A NOTE ON THE DANGER OF THE CAROTID SHEATH
What makes the parapharyngeal abscess particularly dangerous, and worth understanding, is its intimate relationship with the carotid sheath. Because the parapharyngeal space contains the carotid artery, the internal jugular vein and cranial nerves IX to XII, an abscess here can cause a set of serious vascular and neurological complications not seen with a simple quinsy: erosion of the carotid artery (a life-threatening 'carotid blowout' haemorrhage), thrombosis of the internal jugular vein (which, with septic emboli, constitutes Lemierre's syndrome), and palsies of the lower cranial nerves. Added to the shared risks of airway obstruction and downward spread to the mediastinum, this proximity to major vessels makes the parapharyngeal abscess a genuine emergency requiring prompt antibiotics and surgical drainage. Appreciating what lies within the space explains why this deep-neck infection is treated with such urgency.
THE BOTTOM LINE
A parapharyngeal abscess is a deep neck infection whose proximity to the carotid sheath brings the added dangers of carotid blowout, jugular thrombosis and cranial-nerve palsy, demanding urgent antibiotics and drainage.
A further point is that the parapharyngeal space is continuous with the other deep neck spaces and with the mediastinum, so infection here can spread widely, and the same proximity to the great vessels that makes it dangerous also makes surgical drainage technically demanding, usually favouring an external (transcervical) approach that allows the vessels to be safeguarded.
It is also worth noting that, as with all the deep neck-space infections, imaging with contrast-enhanced CT is valuable both to confirm the presence and extent of a collection and to plan drainage safely, since it shows the relationship of the abscess to the great vessels and airway before any surgical intervention.
⚠️
DANGER / REMEMBER: Dangers are carotid-sheath involvement (carotid blowout/haemorrhage, internal jugular vein thrombosis, cranial-nerve palsies), airway obstruction, mediastinitis and Lemierre's syndrome. Management is to secure the airway, give IV antibiotics, drain surgically (external/transcervical or transoral) and treat the source.
🔑
KEY POINTS TO REMEMBER
Parapharyngeal abscess = pus in the lateral pharyngeal space (contains the carotid sheath and cranial nerves IX–XII).