General Surgery
Final Professional MBBS — General Surgery. Explanation-first answers that teach the reasoning behind every fact, with classifications, comparison tables, drug doses, clinical pearls and key-point recaps from Bailey & Love and SRB's Manual.
THE CONCEPT
Benign prostatic hyperplasia (BPH) is a non-cancerous increase in the number of cells of the prostate — specifically the transitional (peri-urethral) zone. Because this zone surrounds the prostatic urethra, its enlargement compresses the urethra and obstructs the outflow of urine from the bladder, producing the lower urinary tract symptoms (LUTS) that define the disease. It is an almost universal consequence of ageing in men.
PATHOPHYSIOLOGY
With increasing age, and under the influence of the androgen dihydrotestosterone (DHT — formed from testosterone by 5-alpha-reductase), the transitional zone undergoes hyperplasia. The enlarging gland compresses the prostatic urethra, so the bladder must generate higher pressures to void. The detrusor muscle initially hypertrophies and trabeculates to compensate, but may eventually decompensate, leading to incomplete emptying and retention.
CLINICAL FEATURES — LUTS
The symptoms divide neatly into two groups:
- Voiding (obstructive) symptoms — hesitancy, a poor or weak stream, straining, intermittency, terminal dribbling, and a sensation of incomplete emptying.
- Storage (irritative) symptoms — frequency, urgency, nocturia and urge incontinence (from the overactive, hypertrophied detrusor).
EXAMINATION & COMPLICATIONS
On digital rectal examination (DRE), BPH gives a smoothly enlarged, firm, rubbery prostate with a palpable median sulcus — in contrast to the hard, nodular, irregular gland with a lost sulcus of carcinoma. Complications of untreated obstruction are important: acute or chronic urinary retention, urinary tract infection, bladder stones, haematuria, overflow incontinence, and — in chronic retention — hydronephrosis and renal impairment.
INVESTIGATION & MANAGEMENT
Investigations include urinalysis, serum PSA (mildly raised; also helps exclude cancer), U&E/creatinine (renal function), ultrasound (post-void residual, hydronephrosis), uroflowmetry, and symptom scoring (IPSS). Management is stepwise:
- Watchful waiting for mild symptoms.
- Medical therapy — alpha-blockers (e.g. tamsulosin) relax prostatic smooth muscle for rapid symptom relief, and 5-alpha-reductase inhibitors (e.g. finasteride) shrink the gland over months; the two may be combined.
- Surgery — transurethral resection of the prostate (TURP) is the gold standard (open prostatectomy for very large glands), indicated for refractory symptoms or complications (retention, stones, recurrent UTI, renal impairment, recurrent haematuria).
💡CLINICAL PEARL: The DRE distinction is a favourite: BPH is a smooth, rubbery, enlarged gland with a preserved median sulcus, whereas carcinoma is hard, nodular and irregular with a lost sulcus. Remember the two drug classes — tamsulosin (alpha-blocker, fast relief) and finasteride (5-ARI, shrinks the gland) — and that TURP is the surgical gold standard.BPH VS PROSTATE CANCER — THE KEY CONTRAST
A recurring exam theme is distinguishing BPH from prostate cancer, and the two differ in almost every respect. BPH affects the central transitional (peri-urethral) zone — which is why it causes obstruction early — whereas cancer arises in the peripheral zone and causes symptoms late. On DRE, BPH is smooth, rubbery and symmetrical with a preserved median sulcus, while cancer is hard, nodular, irregular with a lost sulcus. PSA is usually only mildly raised in BPH but can be markedly elevated in cancer. Keeping this contrast clear prevents mislabelling either condition.
COMPLICATIONS OF TURP
Because TURP is the standard operation, its complications are examinable. Early problems include bleeding, clot retention and urinary infection; the classic (now rare) metabolic complication is 'TURP syndrome' — dilutional hyponatraemia from absorption of hypotonic irrigation fluid, causing confusion and cardiovascular upset. Longer-term effects include retrograde ejaculation (common), erectile dysfunction, urethral stricture, and incontinence. Modern bipolar and laser techniques reduce TURP syndrome. Awareness of these underlies proper consent.
A NOTE ON ACUTE-ON-CHRONIC RETENTION
A common way BPH declares itself is with acute retention — sometimes precipitated by a urinary infection, constipation, alcohol, or drugs with anticholinergic effects. Some men have acute-on-chronic retention, where an already large, poorly-emptying bladder decompensates completely; these patients may have hydronephrosis and renal impairment, and after catheterisation show a large residual and a diuresis. Recognising that a man presenting in retention may have significant underlying obstruction and renal effects guides safe management and the timing of definitive treatment such as TURP.
💊KEY POINTS / NUMBERS (viva)- DRE: BPH = smooth, rubbery, enlarged, median sulcus present; cancer = hard, nodular, sulcus lost.
- Medical: alpha-blocker (tamsulosin — rapid) + 5-alpha-reductase inhibitor (finasteride — shrinks gland).
- Surgery: TURP (gold standard); indications = refractory symptoms, retention, stones, recurrent UTI/haematuria, renal impairment.
🔑KEY POINTS TO REMEMBER- BPH = benign hyperplasia of the transitional (peri-urethral) zone → urethral compression → bladder outflow obstruction (LUTS); driven by DHT with ageing.
- Voiding symptoms (hesitancy, poor stream, straining, dribbling, incomplete emptying) + storage symptoms (frequency, urgency, nocturia).
- DRE: smooth, rubbery, enlarged, median sulcus present (vs hard/nodular/lost sulcus in cancer).
- Complications: acute/chronic retention, UTI, bladder stones, haematuria, hydronephrosis/renal failure.
- Manage with alpha-blockers (tamsulosin) ± 5-ARI (finasteride); TURP is the surgical gold standard for refractory disease/complications.
📚SOURCES: Bailey & Love's Short Practice of Surgery; SRB's Manual of Surgery.THE CONCEPT
Urinary calculi (urolithiasis) are stones that form within the urinary tract — in the kidney, ureter or bladder. They arise when the urine becomes supersaturated with stone-forming salts, which then nucleate and aggregate into a stone, especially where there is dehydration, metabolic abnormality, infection or urinary stasis. Their clinical effects depend on where the stone lodges and whether it obstructs.
TYPES OF STONES
Type Features Calcium (oxalate/phosphate) Commonest (~80%); radio-opaque; linked to hypercalcaemia/hyperoxaluria Struvite (magnesium ammonium phosphate) Infection stones — urease-producing organisms (Proteus); form staghorn calculi Uric acid Radiolucent; associated with gout/high purine, acidic urine Cystine Rare; inherited cystinuria; relatively radiolucent CLINICAL FEATURES
- Ureteric stone (renal colic) — sudden, severe, colicky loin-to-groin pain in a patient who is characteristically restless and writhing (unlike peritonitis, where they lie still), with nausea, vomiting and haematuria; pain radiates to the groin/testis or labium as the stone descends.
- Renal (kidney) stone — may be asymptomatic, or cause a dull loin ache, haematuria or UTI.
- Bladder stone — suprapubic pain, dysuria, an interrupted stream, and haematuria.
- Complications — obstruction with hydronephrosis, infection (an infected obstructed system, pyonephrosis, is an emergency), and renal impairment.
INVESTIGATION
A non-contrast CT of the kidneys, ureters and bladder (CT KUB) is the gold-standard investigation, detecting almost all stones and any obstruction. Urinalysis shows blood; ultrasound and a plain KUB X-ray (for radio-opaque stones) are alternatives; bloods (calcium, urate, U&E) and stone analysis identify the cause.
MANAGEMENT
- Acute renal colic — analgesia (NSAIDs such as diclofenac are first-line), antiemetics and fluids. Most small stones (< 5 mm) pass spontaneously, aided by medical expulsive therapy (tamsulosin).
- Intervention for large, obstructing or non-passing stones — extracorporeal shock-wave lithotripsy (ESWL), ureteroscopy with laser fragmentation, or percutaneous nephrolithotomy (PCNL) for large or staghorn stones.
- An infected, obstructed kidney (pyonephrosis) is a urological emergency requiring urgent decompression (nephrostomy or ureteric stent) plus antibiotics.
- Prevention — good hydration, dietary modification and treating the underlying cause.
💡CLINICAL PEARL: Key facts: calcium oxalate is the commonest stone; struvite (infection) stones form staghorn calculi with Proteus; uric acid stones are radiolucent. Non-contrast CT KUB is the gold-standard test, most small stones pass with NSAIDs, and an infected obstructed kidney (pyonephrosis) is an emergency needing urgent decompression.PATHOPHYSIOLOGY OF RENAL COLIC
The severe, colicky nature of ureteric pain is worth explaining. As a stone lodges and obstructs the ureter, urine builds up behind it, distending the renal pelvis and ureter; the ureter contracts vigorously in waves trying to expel the stone, and it is this peristalsis against an obstruction, plus stretching of the collecting system, that produces the intense, waxing-and-waning pain. The site of pain follows the stone down — loin pain high up, radiating to the groin, then to the testis/labium and tip of the penis as the stone nears the vesico-ureteric junction.
SITES OF IMPACTION & METABOLIC WORK-UP
Stones tend to lodge at the three anatomical narrowings of the ureter — the pelvi-ureteric junction, where the ureter crosses the pelvic brim (iliac vessels), and the vesico-ureteric junction — knowledge that helps interpret imaging. In recurrent stone-formers a metabolic work-up is done (serum calcium, urate, and urinary studies) to detect treatable causes such as hyperparathyroidism, hyperoxaluria or cystinuria, so that recurrence can be prevented rather than merely treating each stone as it arises.
PREVENTION
Prevention is an important and often-forgotten part of stone management. The single most effective measure is increasing fluid intake to keep the urine dilute; specific measures depend on stone type — reducing dietary oxalate and sodium and maintaining normal calcium for calcium stones, allopurinol and urine alkalinisation for uric acid stones, and treating any underlying infection or metabolic disorder. Advising prevention after a first stone reduces the high recurrence rate.
A NOTE ON BLADDER STONES
Although ureteric and renal stones dominate the topic, bladder stones deserve mention: they usually form secondary to stasis and incomplete emptying (bladder outflow obstruction from BPH), a chronic catheter, or infection, rather than descending from the kidney. They cause suprapubic pain, an interrupted stream (the stone intermittently blocking the outlet), dysuria and haematuria, and are treated by fragmentation and removal (cystolitholapaxy) together with correction of the underlying obstruction — linking stone disease back to BPH.
💊KEY POINTS / NUMBERS (viva)- Calcium oxalate commonest (radio-opaque); struvite → staghorn (Proteus); uric acid radiolucent.
- Non-contrast CT KUB is the gold-standard investigation.
- Renal colic: NSAIDs first-line; stones <5 mm usually pass (± tamsulosin); pyonephrosis → urgent decompression + antibiotics.
🔑KEY POINTS TO REMEMBER- Urinary calculi form from supersaturated urine (dehydration, metabolic, infection, stasis); site of lodging determines the picture.
- Types: calcium oxalate (commonest, radio-opaque), struvite (infection/Proteus → staghorn), uric acid (radiolucent), cystine.
- Renal colic: severe loin-to-groin colicky pain, restless patient, haematuria; complications = hydronephrosis, pyonephrosis, renal impairment.
- Non-contrast CT KUB is the gold-standard investigation.
- NSAIDs + fluids for colic (most small stones pass ± tamsulosin); ESWL/ureteroscopy/PCNL for larger stones; pyonephrosis = emergency decompression.
📚SOURCES: Bailey & Love's Short Practice of Surgery; SRB's Manual of Surgery.THE CONCEPT
Carcinoma of the prostate is an adenocarcinoma that typically arises in the peripheral zone of the gland (in contrast to BPH, which affects the central transitional zone). It is one of the commonest cancers in older men and is characteristically androgen-dependent — a fact that underlies its hormonal treatment. Its peripheral location explains why it often causes few early symptoms and why it is felt as a nodule on rectal examination.
RISK FACTORS & CLINICAL FEATURES
Risk rises with age, a family history, and African ethnicity. Because it starts peripherally, it is frequently asymptomatic early; later it may cause LUTS, and it may present with metastatic disease — classically bone pain and back pain from osteosclerotic spinal metastases, or with weight loss. On DRE the gland is hard, nodular and irregular with loss of the median sulcus.
SPREAD
Prostate cancer spreads locally (into the seminal vesicles and bladder base), by lymphatics (to pelvic nodes), and by blood to bone — producing characteristically osteosclerotic (osteoblastic) metastases, especially in the axial skeleton and spine (a cause of back pain and cord compression).
INVESTIGATION, GRADING & STAGING
Assessment uses serum PSA (raised) and DRE, followed by multiparametric MRI and TRUS- (or MRI-) guided biopsy. The biopsy is graded by the Gleason score (now expressed as grade groups), which reflects the architectural differentiation and strongly predicts behaviour. Staging (TNM) includes a bone scan (isotope) to detect skeletal metastases.
MANAGEMENT
- Localised disease — options are active surveillance (low-risk disease), radical prostatectomy, or radical radiotherapy (external beam or brachytherapy).
- Locally advanced disease — radiotherapy combined with hormonal therapy.
- Metastatic disease — androgen deprivation therapy (ADT) exploiting the tumour's hormone dependence: LHRH agonists (e.g. goserelin), anti-androgens, or surgical orchidectomy, with chemotherapy and palliative measures (radiotherapy and bisphosphonates for bone pain).
💡CLINICAL PEARL: Contrast it with BPH throughout: prostate cancer is in the peripheral zone, feels hard and nodular on DRE, and produces osteosclerotic bone metastases (back pain). Remember PSA and the Gleason score, and that metastatic disease is treated by androgen deprivation (medical castration with goserelin, or orchidectomy) because the cancer is androgen-dependent.THE PSA CONTROVERSY
PSA deserves a nuanced note because it is imperfect. It is prostate-specific but not cancer-specific — it also rises with BPH, prostatitis, urinary infection, catheterisation and even DRE — so a raised PSA is not diagnostic and a normal one does not exclude cancer. This is why population screening with PSA is controversial: it detects many indolent cancers that would never have caused harm ('overdiagnosis'), leading to overtreatment. PSA is best used with DRE, MRI and biopsy in a shared decision, rather than as a standalone screening test.
SPINAL CORD COMPRESSION — AN EMERGENCY
A crucial clinical scenario is metastatic spinal cord compression, since prostate cancer characteristically metastasises to the spine. New back pain with leg weakness, sensory change, or bladder/bowel dysfunction in a man with prostate cancer is an emergency requiring urgent MRI and treatment (high-dose steroids, radiotherapy or surgical decompression, plus androgen deprivation) to preserve neurological function. Recognising this prevents permanent paralysis.
HORMONAL THERAPY IN DEPTH
Because the tumour is androgen-dependent, androgen deprivation therapy (ADT) is the cornerstone of advanced disease. This is achieved by surgical castration (bilateral orchidectomy) or, more commonly, medical castration with LHRH agonists (e.g. goserelin) — which paradoxically cause an initial testosterone 'flare' (covered by an anti-androgen). ADT has significant side-effects (hot flushes, loss of libido, osteoporosis, metabolic effects), and cancers eventually become 'castration-resistant', requiring further agents — so treatment balances disease control against quality of life.
A NOTE ON PROSTATITIS IN THE DIFFERENTIAL
When assessing the prostate it is worth remembering prostatitis in the differential of a raised PSA and prostatic symptoms. Acute bacterial prostatitis causes fever, perineal/pelvic pain, LUTS and an exquisitely tender prostate on gentle DRE (vigorous examination or massage is avoided in the acute phase), and it can markedly elevate PSA. Recognising prostatitis prevents misinterpreting a transiently high PSA as cancer, and ensures the infection is treated with an appropriate prolonged course of antibiotics.
💊KEY POINTS / NUMBERS (viva)- Peripheral zone; DRE hard/nodular/irregular; PSA raised; graded by Gleason score (grade group).
- Osteosclerotic (osteoblastic) bone metastases — spine → back pain/cord compression; bone scan for staging.
- Metastatic disease → androgen deprivation therapy (LHRH agonist e.g. goserelin, anti-androgen, or orchidectomy).
🔑KEY POINTS TO REMEMBER- Prostate adenocarcinoma arises in the peripheral zone; common in older men; androgen-dependent.
- Often asymptomatic early; later LUTS or metastatic bone/back pain; DRE hard, nodular, irregular, sulcus lost.
- Spreads locally, to nodes, and to bone (osteosclerotic metastases, axial skeleton/spine).
- PSA + DRE + mpMRI + TRUS biopsy (Gleason score/grade group); bone scan for skeletal staging.
- Localised: surveillance/radical prostatectomy/radiotherapy; metastatic: androgen deprivation (goserelin/orchidectomy) ± chemo.
📚SOURCES: Bailey & Love's Short Practice of Surgery; SRB's Manual of Surgery.THE CONCEPT
Renal cell carcinoma (RCC) is an adenocarcinoma arising from the proximal renal tubular epithelium, and it is the commonest primary malignant tumour of the kidney in adults. It is sometimes called the 'internist's tumour' because it produces a remarkable variety of systemic and paraneoplastic features, and can present in many disguises — a point that makes it a favourite exam topic.
RISK FACTORS
The main risk factors are smoking, obesity, hypertension, and acquired cystic disease in patients on long-term dialysis. A hereditary form occurs in von Hippel-Lindau syndrome.
CLINICAL FEATURES
- The classic triad — haematuria, loin pain and a loin mass — is actually a late finding present in only ~10%; nowadays most RCCs are found incidentally on imaging done for other reasons.
- Paraneoplastic features are characteristic: polycythaemia (erythropoietin), hypercalcaemia (PTH-related peptide), hypertension (renin), pyrexia of unknown origin, and Stauffer's syndrome (reversible hepatic dysfunction).
- A left-sided varicocele may occur when tumour invades the left renal vein and obstructs the testicular vein.
- Metastases classically produce 'cannonball' deposits in the lungs, and spread to bone.
INVESTIGATION & MANAGEMENT
CT is the key investigation for diagnosis and staging, showing an enhancing solid renal mass and assessing renal-vein/IVC involvement and metastases; ultrasound and blood tests support this. Management is chiefly surgical:
- Localised disease — radical or partial (nephron-sparing) nephrectomy.
- Metastatic disease — cytoreductive nephrectomy in selected patients plus targeted therapy (tyrosine kinase inhibitors such as sunitinib) and immunotherapy; RCC is notably resistant to conventional chemotherapy and radiotherapy.
💡CLINICAL PEARL: Two exam favourites: the classic triad (haematuria + loin pain + loin mass) is a late, uncommon presentation — most RCCs are now incidental. And RCC's paraneoplastic tricks — polycythaemia, hypercalcaemia, a new left varicocele (renal-vein invasion), and 'cannonball' lung metastases — earn it the name 'internist's tumour'. Treatment is nephrectomy, with TKIs for metastatic disease (it resists chemo/radiotherapy).STAGING & THE ROLE OF THE RENAL VEIN/IVC
RCC has a characteristic tendency to grow along the venous system, and this shapes staging and surgery. The tumour can extend as a tumour thrombus into the renal vein and up the inferior vena cava, occasionally reaching the right atrium — a feature that CT/MRI specifically assesses because it affects the operative approach. This venous behaviour also explains the left-sided varicocele (obstruction of the testicular vein) that can herald a left renal tumour.
WHY IT RESISTS CHEMO & THE RISE OF TARGETED THERAPY
A distinctive feature of RCC is its resistance to conventional chemotherapy and radiotherapy, which is why surgery dominates management. For metastatic disease, treatment has been transformed by targeted agents — tyrosine kinase inhibitors (sunitinib, pazopanib) acting on the VEGF angiogenesis pathway — and immune checkpoint inhibitors, reflecting the tumour's vascular and immunogenic biology (its link to the VHL gene and HIF pathway). Even in metastatic disease, cytoreductive nephrectomy may be beneficial in selected patients.
A NOTE ON THE INCIDENTAL MASS
Because so many RCCs are now found incidentally as a small enhancing renal mass on a scan done for another reason, an important modern issue is management of the small renal mass: options include partial (nephron-sparing) nephrectomy, ablation, or active surveillance in the elderly or unfit, since not every small mass is aggressive. This shift from the classic late 'triad' presentation to early incidental detection has improved outcomes.
A NOTE ON THE BOSNIAK CLASSIFICATION
In assessing renal masses, the Bosniak classification of cystic renal lesions on CT is a useful practical tool: it grades cysts from clearly benign (Bosniak I–II) through indeterminate (IIF, needing follow-up) to those with an increasing likelihood of malignancy (III–IV, warranting surgery). This helps decide which incidentally-found renal cystic lesions can be safely watched and which need intervention — an increasingly important judgement now that so many renal lesions are detected incidentally on imaging.
💊KEY POINTS / NUMBERS (viva)- Classic triad (haematuria + loin pain + loin mass) is late and present in only ~10%; most are incidental.
- Paraneoplastic: polycythaemia (EPO), hypercalcaemia (PTHrP), hypertension (renin); left varicocele (renal-vein invasion); cannonball lung metastases.
- Treat by radical/partial nephrectomy; metastatic → TKIs (sunitinib)/immunotherapy (resistant to chemo/radiotherapy).
🔑KEY POINTS TO REMEMBER- RCC = adenocarcinoma of proximal renal tubular epithelium; commonest adult renal cancer; 'internist's tumour' (paraneoplastic features).
- Risk: smoking, obesity, hypertension, dialysis/acquired cystic disease, von Hippel-Lindau.
- Classic triad (haematuria, loin pain, mass) is late/uncommon; most incidental; paraneoplastic (polycythaemia, hypercalcaemia), left varicocele, cannonball lung mets.
- CT for diagnosis and staging (enhancing renal mass, renal vein/IVC).
- Radical/partial nephrectomy; metastatic → TKIs (sunitinib)/immunotherapy (resistant to chemo/radiotherapy).
📚SOURCES: Bailey & Love's Short Practice of Surgery; SRB's Manual of Surgery.THE CONCEPT
Carcinoma of the bladder is usually a transitional cell (urothelial) carcinoma, arising from the lining of the bladder. It is commonest in older men and is strongly linked to carcinogens excreted in the urine — above all cigarette smoking and certain occupational chemicals. Its hallmark presentation, painless visible haematuria, is one of the most important 'red flag' symptoms in surgery.
RISK FACTORS & TYPES
Risk factors: smoking (the major cause), occupational exposure to aromatic amines (in the dye, rubber and chemical industries), chronic inflammation, and schistosomiasis. The histological type reflects the cause: transitional cell carcinoma is commonest; squamous cell carcinoma arises with chronic irritation or schistosomiasis; and adenocarcinoma is rare.
CLINICAL FEATURES
The cardinal symptom is painless, visible (macroscopic) haematuria — which must always be investigated to exclude cancer. There may also be recurrent urinary infections and irritative LUTS; advanced disease causes pain, a mass, and ureteric obstruction.
INVESTIGATION & STAGING
Cystoscopy with biopsy is the gold-standard investigation, allowing direct visualisation and tissue diagnosis; urine cytology and CT urography (which also images the upper tracts and stages the disease) complete the work-up. The crucial staging distinction is between non-muscle-invasive and muscle-invasive disease, as this determines treatment.
MANAGEMENT
- Non-muscle-invasive disease — transurethral resection of the bladder tumour (TURBT) plus intravesical therapy (BCG or mitomycin), with regular surveillance cystoscopy (recurrence is common).
- Muscle-invasive disease — radical cystectomy with urinary diversion (e.g. an ileal conduit), often with neoadjuvant chemotherapy, or radical radiotherapy.
- Metastatic disease — chemotherapy.
💡CLINICAL PEARL: The rule to state first: painless visible haematuria is bladder cancer until proven otherwise and mandates urgent cystoscopy. Remember the causal links — smoking and aromatic amines for transitional cell carcinoma, and schistosomiasis for squamous cell carcinoma — and the pivotal non-muscle-invasive (TURBT + BCG) versus muscle-invasive (cystectomy) divide that governs treatment.WHY IT RECURS — THE 'FIELD CHANGE'
A defining feature of urothelial (transitional cell) cancer is that the entire urothelial lining — from the renal pelvis through the ureters to the bladder and urethra — has been exposed to the same carcinogens, a 'field change'. This is why bladder cancer is characteristically multifocal and recurrent, why lifelong surveillance cystoscopy is needed after treatment, and why the upper tracts are also imaged (CT urogram) to look for synchronous tumours. Understanding the field change explains the whole follow-up strategy.
INTRAVESICAL THERAPY EXPLAINED
For non-muscle-invasive disease, intravesical therapy after TURBT reduces recurrence and progression. Intravesical BCG (an immunotherapy that provokes a local immune response) is used for higher-risk disease and carcinoma in situ, while intravesical chemotherapy (mitomycin C) is used for lower-risk tumours. This local, bladder-directed treatment delivers high drug concentrations to the at-risk urothelium while limiting systemic effects — a neat example of matching treatment to the field-change biology.
MUSCLE-INVASIVE DISEASE & DIVERSION
The step up to muscle-invasive disease is the critical prognostic watershed. It is treated by radical cystectomy (with pelvic lymphadenectomy) plus urinary diversion — most often an ileal conduit (a segment of ileum bringing the ureters to a stoma), or a neobladder in selected patients — usually with neoadjuvant chemotherapy; bladder-preserving radical radiotherapy is an alternative. Counselling about the stoma and its consequences is a major part of care, underlining why the non-muscle-invasive versus muscle-invasive distinction governs everything.
A NOTE ON UPPER-TRACT UROTHELIAL TUMOURS
Because the whole urothelium shares the field change, urothelial (transitional cell) carcinoma can also arise in the renal pelvis and ureter, not just the bladder. Such upper-tract tumours also present with visible haematuria (and sometimes loin pain from clot obstruction), are imaged by CT urography and ureteroscopy, and are classically treated by nephro-ureterectomy (removing the kidney and the whole ureter with a bladder cuff, because of the multifocal field risk). This is why investigating haematuria always includes imaging the upper tracts, not just cystoscopy of the bladder.
💊KEY POINTS / NUMBERS (viva)- Painless visible haematuria = bladder cancer until proven otherwise → cystoscopy.
- Transitional cell (smoking, aromatic amines) commonest; squamous cell with schistosomiasis/chronic irritation.
- Non-muscle-invasive → TURBT + intravesical BCG/mitomycin + surveillance; muscle-invasive → radical cystectomy (± neoadjuvant chemo) or radiotherapy.
🔑KEY POINTS TO REMEMBER- Bladder cancer = usually transitional cell (urothelial) carcinoma; older men; from urinary carcinogens.
- Risk: smoking (major), occupational aromatic amines, chronic inflammation/schistosomiasis (→ squamous cell carcinoma).
- Hallmark: painless visible haematuria — always investigate (exclude cancer).
- Cystoscopy + biopsy (gold standard) + urine cytology + CT urogram; key divide = non-muscle-invasive vs muscle-invasive.
- Non-muscle-invasive: TURBT + intravesical BCG/mitomycin + surveillance; muscle-invasive: radical cystectomy (+ diversion) ± neoadjuvant chemo, or radiotherapy.
📚SOURCES: Bailey & Love's Short Practice of Surgery; SRB's Manual of Surgery.THE CONCEPT
Acute urinary retention is the sudden, painful inability to pass urine, with a palpable, tender, distended bladder. It is a common urological emergency, and the pain and acute onset distinguish it from chronic retention (which is painless with a large residual). The commonest cause is bladder outflow obstruction from benign prostatic hyperplasia.
CAUSES
Besides BPH, causes include a urethral stricture, a blood clot (clot retention), prostatitis or a urinary infection, severe constipation, drugs (anticholinergics, opioids), neurological disease, and the post-operative state. Identifying the precipitant guides definitive management.
CLINICAL FEATURES & MANAGEMENT
The patient is in acute discomfort with a strong desire to void but cannot, and a tender suprapubic swelling (the distended bladder) is palpable and dull to percussion. Immediate management is to relieve the obstruction by urethral catheterisation (or suprapubic catheterisation if the urethral route fails), which brings prompt relief; the residual volume drained is recorded. The cause is then identified and treated (e.g. an alpha-blocker and later TURP for BPH).
POST-OBSTRUCTIVE DIURESIS
After decompressing a very full or chronically obstructed bladder, one must watch for post-obstructive diuresis — a large diuresis that can cause dehydration and electrolyte disturbance — with monitoring of urine output and fluid balance. In chronic retention, by contrast, the bladder is grossly distended but painless, and there may already be renal impairment from back-pressure.
CHRONIC RETENTION & THE HIGH-PRESSURE SYSTEM
Chronic retention deserves contrast because it is managed differently: it is painless, the bladder is grossly distended, and there may be overflow incontinence. A 'high-pressure' chronic retention causes bilateral hydronephrosis and renal impairment, and relieving it produces a marked post-obstructive diuresis that needs careful fluid and electrolyte monitoring. This is why catheterising a chronically retained bladder is not simply a matter of instant cure but requires attention to renal function and diuresis.
THE BOTTOM LINE
Acute urinary retention is a painful emergency (usually from BPH) relieved by immediate catheterisation, after which the cause is treated and post-obstructive diuresis watched for; chronic retention is painless with a large residual and possible renal impairment.
A NOTE ON CATHETERISATION
Practical management centres on catheterisation: a urethral catheter is passed to relieve the obstruction, but if it fails (as with a tight stricture or a large obstructing prostate) a suprapubic catheter is inserted. The drained residual volume is recorded (a large volume suggests chronic or acute-on-chronic retention), a urine sample is sent, and renal function is checked. This immediate decompression relieves the pain and protects the kidneys while the underlying cause is addressed.
🔑KEY POINTS TO REMEMBER- Acute urinary retention = sudden painful inability to void with a palpable, tender, distended bladder; commonest cause BPH.
- Other causes: urethral stricture, clot retention, prostatitis/UTI, constipation, drugs, neurological, post-operative.
- Immediate treatment: urethral (or suprapubic) catheterisation for relief; record residual volume; then treat the cause.
- Watch for post-obstructive diuresis after decompression; chronic retention is painless with a large residual and may cause renal impairment.
📚SOURCES: Bailey & Love's Short Practice of Surgery.THE CONCEPT
Haematuria is the presence of blood in the urine, and it is a symptom that must always be taken seriously because it can be the first sign of a urological malignancy. It is classified as visible (macroscopic) or non-visible (microscopic), and the timing during the stream can hint at the source (initial — urethral; terminal — bladder base/prostate; total — bladder or upper tract).
CAUSES
The causes span the whole urinary tract: malignancy (bladder, kidney/renal cell carcinoma, prostate — the crucial ones to exclude), stones, infection, and BPH, along with 'medical' (glomerular) causes such as glomerulonephritis (suggested by proteinuria, red-cell casts and dysmorphic red cells). The most important clinical rule is that painless visible haematuria is a urological malignancy until proven otherwise.
INVESTIGATION
The work-up aims chiefly to exclude cancer: urinalysis and culture (infection), cystoscopy (to inspect the bladder — the key test for visible haematuria), CT urography (to image the kidneys and upper tracts), and urine cytology. Blood tests assess renal function, and features suggesting a glomerular cause prompt a nephrological rather than urological pathway.
TIMING OF HAEMATURIA & GLOMERULAR CLUES
The pattern of bleeding gives clues: initial haematuria (start of the stream) points to a urethral source, terminal haematuria (end of the stream) to the bladder neck or prostate, and total haematuria to the bladder or upper tracts. Features pointing to a glomerular (medical) cause — and hence to nephrology rather than urology — include coexisting proteinuria, red-cell casts, dysmorphic red cells and hypertension. Separating surgical from medical haematuria directs the correct pathway.
THE BOTTOM LINE
Haematuria — especially painless visible haematuria — is a urological malignancy until proven otherwise, investigated by cystoscopy, CT urogram and cytology, with glomerular features directing instead to nephrology.
A NOTE ON NON-VISIBLE HAEMATURIA
Non-visible (microscopic) haematuria is common and often benign but still needs a considered approach: it is confirmed on repeat testing, an infection is excluded, and the decision to investigate (with cystoscopy and imaging) depends on age and risk factors, since it too can be the first sign of a urological cancer. Persistent non-visible haematuria with proteinuria or abnormal renal function is investigated as a possible glomerular disease, whereas isolated non-visible haematuria in an older smoker is investigated urologically.
🔑KEY POINTS TO REMEMBER- Haematuria = blood in urine; visible (macroscopic) or non-visible (microscopic); timing hints at the source.
- Causes: malignancy (bladder, kidney, prostate — exclude), stones, infection, BPH, and glomerular/medical causes.
- Painless visible haematuria = urological malignancy until proven otherwise.
- Investigate to exclude cancer: urinalysis/culture, cystoscopy, CT urogram, urine cytology; glomerular features → nephrology.
📚SOURCES: Bailey & Love's Short Practice of Surgery.THE CONCEPT
Testicular tumours are important because, although uncommon, they are the commonest solid malignancy in young men (aged ~20–40) and are highly curable if managed correctly. The great majority are germ cell tumours, divided into two groups that behave and are treated differently: seminoma and non-seminomatous germ cell tumours (NSGCT).
TYPES, RISK & PRESENTATION
Seminoma is the commonest single type, tends to occur slightly later, and is radiosensitive. NSGCTs include teratoma, yolk-sac tumour and choriocarcinoma. The major risk factor is a history of cryptorchidism (undescended testis). The typical presentation is a painless, firm, hard testicular lump or swelling that does not transilluminate.
TUMOUR MARKERS, INVESTIGATION & TREATMENT
Tumour markers are central: alpha-fetoprotein (AFP) is raised in NSGCT (yolk-sac elements), beta-hCG in choriocarcinoma and some seminomas, and LDH reflects tumour bulk. Investigation is by scrotal ultrasound and markers, with CT for staging. A cardinal rule is that the testis is NEVER biopsied through the scrotum (this risks tumour spread and alters lymphatic drainage); instead a radical inguinal orchidectomy is performed, which is both diagnostic and therapeutic. Further chemotherapy or radiotherapy is given according to type and stage, with an excellent overall prognosis.
STAGING & PROGNOSIS
After orchidectomy, staging (with CT and post-orchidectomy tumour markers) and the tumour type guide further treatment: seminomas are exquisitely radiosensitive and chemosensitive, while NSGCTs are treated primarily with platinum-based chemotherapy for metastatic disease. Testicular germ cell tumours are among the most curable of all solid cancers — even metastatic disease has high cure rates — which is why prompt, correct management (never a scrotal biopsy) matters so much.
THE BOTTOM LINE
Testicular tumours are the commonest cancer of young men, usually germ-cell (seminoma vs NSGCT), diagnosed by ultrasound and markers and treated by radical inguinal orchidectomy (never a scrotal biopsy) plus chemo/radiotherapy, with excellent cure rates.
A NOTE ON UNDESCENDED TESTIS
The link with cryptorchidism (undescended testis) is worth expanding: an undescended testis carries a significantly increased risk of malignancy (and the risk applies to both testes), which is one reason orchidopexy is performed in childhood. Even after correction the risk is not fully abolished, so men with a history of undescended testis are advised to perform testicular self-examination. This preventive angle complements the treatment of established tumours.
🔑KEY POINTS TO REMEMBER- Testicular tumours: commonest solid cancer in young men (20–40); mostly germ cell — seminoma (radiosensitive) vs NSGCT (teratoma, yolk sac, choriocarcinoma).
- Risk factor: cryptorchidism (undescended testis); presents as a painless, hard testicular lump (doesn't transilluminate).
- Markers: AFP (NSGCT/yolk sac), beta-hCG (choriocarcinoma, some seminoma), LDH; ultrasound + CT staging.
- NEVER biopsy through the scrotum (spread) → radical inguinal orchidectomy (diagnostic + therapeutic) + chemo/radiotherapy; excellent prognosis.
📚SOURCES: Bailey & Love's Short Practice of Surgery.THE CONCEPT
Testicular torsion is a twisting of the spermatic cord that occludes the testicular blood supply, causing ischaemia of the testis. It is a true urological emergency because the testis becomes non-viable within about 6 hours of the onset of ischaemia. It occurs mainly in adolescents and young men, and is predisposed to by a congenital 'bell-clapper' deformity (a high investment of the tunica vaginalis allowing the testis to hang and rotate freely).
CLINICAL FEATURES
There is sudden, severe testicular pain (often with lower abdominal pain), swelling, and nausea/vomiting. Examination shows a tender, high-riding testis that may lie horizontally, an absent cremasteric reflex, and a negative Prehn's sign (elevating the testis does not relieve the pain — in contrast to epididymo-orchitis, where it may).
MANAGEMENT — DO NOT DELAY
Torsion is a clinical diagnosis, and treatment must not be delayed for imaging — any delay costs the testis. The patient goes for immediate surgical exploration: the cord is untwisted (detorsion) and, if the testis is viable, it is fixed to prevent recurrence; both testes are fixed (bilateral orchidopexy) because the predisposing deformity is usually bilateral. A non-viable testis is removed (orchidectomy).
💡CLINICAL PEARL: The overriding message: testicular torsion is a clinical diagnosis and a time-critical emergency — the testis dies within ~6 hours, so any boy or young man with sudden severe testicular pain goes straight to theatre. Do not wait for an ultrasound. Fix both testes, as the bell-clapper deformity is bilateral.DIFFERENTIAL — THE ACUTE SCROTUM
Torsion must be distinguished from the other causes of an acute scrotum — epididymo-orchitis and torsion of a testicular appendage (hydatid of Morgagni). Epididymo-orchitis tends to have a more gradual onset with urinary symptoms and a positive Prehn's sign (relief on elevation), while a torted appendage may show a 'blue dot' sign. However, because missing torsion costs the testis, the safe rule is that an acute scrotum is torsion until proven otherwise, and exploration is preferred to risky delay.
THE BOTTOM LINE
Testicular torsion is a clinical, time-critical emergency (the testis dies within ~6 hours) demanding immediate exploration, detorsion and bilateral orchidopexy — never delayed for imaging.
A NOTE ON THE 6-HOUR WINDOW
The emphasis on the 6-hour window reflects testicular physiology: salvage rates are high if detorsion occurs within about 6 hours, fall sharply thereafter, and are poor beyond ~12–24 hours. This is why the pathway is 'explore first, image never-if-it-delays' — a Doppler ultrasound can support the diagnosis where it is genuinely in doubt and immediately available, but it must not postpone surgery in a clinically convincing case. The clock, not the scan, drives management.
🔑KEY POINTS TO REMEMBER- Testicular torsion = twisting of the spermatic cord → testicular ischaemia; emergency (testis non-viable in ~6 h); adolescents/young men; bell-clapper deformity.
- Sudden severe testicular pain, swelling, vomiting; high-riding tender testis, absent cremasteric reflex, negative Prehn's sign.
- Clinical diagnosis — do NOT delay for imaging.
- Immediate surgical exploration + detorsion + bilateral orchidopexy (fix both); orchidectomy if non-viable.
📚SOURCES: Bailey & Love's Short Practice of Surgery.THE CONCEPT
A hydrocele is an abnormal collection of serous fluid within the tunica vaginalis, the potential space surrounding the testis. Because the fluid envelops the testis, it produces a characteristic scrotal swelling with signs that make it one of the most reliably diagnosed lumps in surgery.
CLINICAL FEATURES — THE CLASSIC SIGNS
A hydrocele is a painless, smooth, fluctuant scrotal swelling that transilluminates brilliantly (being fluid-filled), and above which one can 'get above' (the swelling is confined to the scrotum, unlike an inguinoscrotal hernia). Because the fluid surrounds the testis, the testis itself cannot usually be palpated separately within the swelling.
TYPES & MANAGEMENT
A primary (idiopathic) hydrocele is common and benign; a congenital hydrocele in infants results from a patent processus vaginalis and often resolves. A secondary hydrocele forms in response to underlying testicular disease — tumour, infection or trauma — so it is essential to exclude an underlying testicular pathology (with ultrasound) especially if the testis cannot be felt or the patient is young. Treatment of a symptomatic adult hydrocele is surgical (Jaboulay's or Lord's procedure); infantile hydroceles are usually observed as many resolve.
DIFFERENTIAL & THE MEANING OF TRANSILLUMINATION
The clinical signs place the hydrocele among scrotal swellings: because one can get above it, it is not an inguinoscrotal hernia; because it transilluminates and is fluctuant, it is cystic rather than the solid, non-transilluminating mass of a tumour. The crucial caveat remains that a tense hydrocele can hide an underlying testicular tumour, so if the testis cannot be assessed, an ultrasound is mandatory before attributing the swelling to a simple hydrocele.
THE BOTTOM LINE
A hydrocele is a transilluminating, fluctuant scrotal swelling you can get above, benign when primary but requiring ultrasound to exclude an underlying testicular tumour when secondary or when the testis cannot be felt.
A NOTE ON INFANTILE HYDROCELE
The congenital (infantile) hydrocele is a distinct entity: it results from a patent processus vaginalis allowing peritoneal fluid to track down around the testis, and it is often communicating (varying in size through the day). Most resolve spontaneously as the processus closes in the first year or two of life, so they are usually observed; persistence beyond about 1–2 years, or an associated hernia, is an indication for surgery (herniotomy/ligation of the processus).
🔑KEY POINTS TO REMEMBER- Hydrocele = serous fluid collection within the tunica vaginalis around the testis.
- Painless, fluctuant scrotal swelling that transilluminates brilliantly; can 'get above it'; testis not separately palpable.
- Primary/idiopathic (or congenital — patent processus in infants) vs secondary (tumour, infection, trauma — exclude with ultrasound).
- Infantile hydroceles often resolve; symptomatic adult hydroceles → surgery (Jaboulay's/Lord's).
📚SOURCES: Bailey & Love's Short Practice of Surgery.THE CONCEPT
A varicocele is an abnormal dilatation and tortuosity of the pampiniform plexus of veins draining the testis — essentially varicose veins of the scrotum. It is far commoner on the left side, and the anatomical reason is classic: the left testicular vein drains at a right angle into the left renal vein (whereas the right drains obliquely into the inferior vena cava), making the left side more prone to raised venous pressure and reflux.
CLINICAL FEATURES
A varicocele feels like a 'bag of worms' in the scrotum, is more prominent on standing and on Valsalva, and decompresses (empties) on lying down. It may be asymptomatic or cause a dull dragging scrotal ache, and is an important cause of male subfertility (the raised temperature and venous stasis impair spermatogenesis).
AN IMPORTANT WARNING & MANAGEMENT
A key clinical alarm: a varicocele that is right-sided, of sudden onset, or that does not decompress on lying down should raise suspicion of a renal tumour (renal cell carcinoma) obstructing the renal/testicular vein, and warrants imaging of the kidneys. Treatment of a symptomatic varicocele, or one causing subfertility, is by surgical ligation or radiological embolisation of the testicular vein.
VARICOCELE & SUBFERTILITY
The link with subfertility is an important theme: a varicocele raises scrotal temperature and causes venous stasis, impairing spermatogenesis and sometimes producing abnormal semen parameters. In a subfertile man with a clinically significant varicocele and abnormal semen analysis, varicocele repair (ligation or embolisation) may improve fertility. This, along with troublesome pain, is a leading indication for treating what is otherwise a benign condition.
THE BOTTOM LINE
A varicocele is a 'bag of worms' dilatation of the pampiniform plexus, usually left-sided, causing ache and subfertility and treated by ligation/embolisation — with a right-sided or non-decompressing varicocele prompting a search for a renal tumour.
A NOTE ON GRADING & ASSESSMENT
Varicoceles are graded clinically — subclinical (only on imaging), grade 1 (palpable on Valsalva), grade 2 (palpable at rest), and grade 3 (visible) — which, together with symptoms and semen analysis, informs whether to treat. Ultrasound with Doppler confirms venous reflux and, importantly, allows the kidneys to be assessed when a right-sided or non-decompressing varicocele raises concern about an obstructing renal tumour. This structured assessment separates the benign majority from the few needing further work-up.
🔑KEY POINTS TO REMEMBER- Varicocele = dilatation/tortuosity of the pampiniform plexus ('bag of worms'); commoner on the left (left testicular vein → left renal vein at a right angle).
- More prominent on standing/Valsalva, decompresses on lying down; may cause a dragging ache and subfertility.
- Right-sided, sudden-onset, or non-decompressing varicocele → suspect a renal tumour (image the kidneys).
- Treat symptomatic/subfertility-related varicoceles by surgical ligation or embolisation.
📚SOURCES: Bailey & Love's Short Practice of Surgery.THE CONCEPT
Wilms' tumour (nephroblastoma) is the commonest renal malignancy of childhood, typically presenting in children under 5 years old. It is an embryonal tumour arising from primitive (metanephric) renal tissue, and it is important both as a paediatric surgical emergency-of-diagnosis and as one of the great successes of modern paediatric oncology, with an excellent prognosis when treated appropriately.
CLINICAL FEATURES
The classic presentation is a large, smooth abdominal (flank) mass in an otherwise well young child, often noticed by a parent during bathing. The mass characteristically does not cross the midline (a helpful distinction from neuroblastoma, which does). Other features include haematuria, abdominal pain and hypertension (from renin). It may be associated with syndromes such as WAGR and Beckwith-Wiedemann.
INVESTIGATION & MANAGEMENT
Diagnosis and staging use ultrasound and CT; a key principle is to avoid percutaneous biopsy where possible, because rupturing the tumour capsule risks spreading the tumour and upstaging it. Treatment is a combination of nephrectomy and chemotherapy (with radiotherapy for higher-stage disease), delivered by a specialist paediatric oncology team, and gives high cure rates.
CONTRAST WITH NEUROBLASTOMA
A classic paediatric exam contrast is Wilms' tumour versus neuroblastoma. Both cause an abdominal mass in a young child, but the Wilms' (renal) mass does not cross the midline and the child is usually well, whereas the neuroblastoma (from the adrenal/sympathetic chain) often crosses the midline, is irregular, and the child is systemically unwell (with features such as periorbital bruising and catecholamine effects). This distinction, plus the age and imaging, points to the diagnosis.
THE BOTTOM LINE
Wilms' tumour is the commonest childhood renal cancer, a flank mass that does not cross the midline, diagnosed on imaging (avoiding biopsy) and treated by nephrectomy plus chemotherapy with an excellent prognosis.
A NOTE ON PROGNOSIS & STAGE
Wilms' tumour is one of paediatric oncology's success stories, with overall cure rates above 85–90% when managed by a specialist team, because it responds well to combined nephrectomy and chemotherapy. Prognosis depends on the stage and the histology (favourable vs anaplastic), and avoiding tumour rupture at surgery (which upstages the disease and worsens outcome) is a key surgical principle — reinforcing why biopsy and rough handling are avoided.
🔑KEY POINTS TO REMEMBER- Wilms' tumour (nephroblastoma) = commonest childhood renal cancer (under 5 years); embryonal tumour.
- Large smooth flank mass in a well child that does NOT cross the midline (vs neuroblastoma, which does); haematuria, hypertension; syndromes (WAGR, Beckwith-Wiedemann).
- Ultrasound + CT for diagnosis/staging; avoid biopsy (risk of rupture/spread/upstaging).
- Treat with nephrectomy + chemotherapy (± radiotherapy); excellent prognosis.
📚SOURCES: Bailey & Love's Short Practice of Surgery.