Describe the subperiosteal abscesses and the prevention of otogenic complications.

Extracranial Complications Not Yet Covered

• Subperiosteal abscesses arise when pus from a coalescent mastoid perforates the cortex, and each is named for its direction:
• Postauricular abscess — through the lateral cortex, the commonest, giving the classical swelling that obliterates the retroauricular sulcus and pushes the pinna out and forward
• BEZOLD abscess — through the thin medial wall of the mastoid tip, tracking deep to sternocleidomastoid into the neck. It gives a tender neck swelling with torticollis and NO postauricular swelling, and is therefore missed. It cannot occur in an infant, whose mastoid tip has not developed

Prevention and the Changing Pattern

• The pattern OF otogenic complications has changed, and understanding how IS itself examinable:
• The incidence has fallen greatly in high-income countries with antibiotics, vaccination and access to care — but remains substantial in India and other low-income settings
• The presentation has become atypical: partial antibiotic treatment produces masked mastoiditis, low-grade illness without rigors, and abscesses presenting with few signs. The classical textbook picture is now the exception
• The balance has shifted from acute to chronic disease as the source, and therefore from children to adults, and from meningitis toward brain abscess and sinus thrombosis
• Diagnosis is now radiological rather than clinical.
• Mortality has fallen but remains real, and is determined chiefly by delay in diagnosis and by the conscious level at presentation
• Prevention, which is where the real gain lies:
• Adequate and complete treatment of acute otitis media — correct drug, correct dose, full course, and follow-UP until the drum and hearing are normal
• Do not give partial or inappropriate antibiotics, which is the specific mechanism that creates masked disease — and which is encouraged by over-the-counter availability in India
• Early definitive surgery for cholesteatoma, rather than years of drops and repeated toilet. Cholesteatoma is the single greatest preventable cause of otogenic complications
• Treat chronic suppurative otitis media properly — aural toilet, appropriate topical agents, treatment of the nose, and tympanoplasty once dry, rather than leaving a perforation for decades
• Immunisation — pneumococcal conjugate, haemophilus influenzae type b, measles and influenza vaccines, each of which reduces the burden of the disease that leads to complications
• Improve nutrition and living conditions, and address passive smoking
• Educate patients and primary care staff — that a discharging ear is not normal, that it should not simply be dried and ignored, and that pain, fever, headache, dizziness or facial weakness in a discharging ear require immediate referral