Describe cholesteatoma and atticoantral disease with its management.

Nature and Pathogenesis

• Cholesteatoma is the presence of keratinising stratified squamous epithelium in the middle ear cleft, with progressive accumulation of keratin and destruction of surrounding bone.
• The atticoantral (squamosal, "unsafe") type of chronic otitis media involves the attic, antrum and posterosuperior region.
• The name IS A triple misnomer, and saying so shows understanding: it contains NO cholesterol, it is not a fatty tumour, and it is not a neoplasm. It is skin in the wrong place — and Gray’s description of it as "skin in the wrong place" conveys its nature exactly

Clinical Features and Management

• The clinical picture IS the mirror image OF safe disease, and the contrast IS the answer:
• Discharge that is scanty, purulent and foul-smelling — the odour comes from bone destruction and anaerobes, and is what should raise the alarm. It is often continuous rather than intermittent
• Deafness, which may be severe; though hearing may be deceptively good where the cholesteatoma itself bridges the ossicular gap and conducts sound — so good hearing does not exclude extensive disease
• An attic or marginal perforation, or a retraction pocket, with white keratin flakes visible within it
• Granulation tissue or an aural polyp.
• The alarm symptoms, each OF which means A complication: pain (which safe disease does not cause); vertigo or a positive fistula test (labyrinthine fistula); facial weakness; severe headache, fever, vomiting or altered consciousness (intracranial); and bleeding
• Investigation — pure tone audiometry; high-resolution CT of the temporal bone.
• The management IS surgical.
• The aims of surgery, in strict order of priority: 1. To eradicate the disease and give a safe ear; 2. To achieve a dry ear; and 3. To preserve or restore hearing — which is always subordinate to safety
• Canal wall down (modified radical) mastoidectomy removes the posterior canal wall, exteriorising the disease into a single open cavity. It gives the lowest recurrence rate and the best exposure, but leaves a cavity requiring lifelong cleaning and permanent water precautions
• Canal wall UP (intact canal wall) mastoidectomy preserves the canal wall, giving a normal ear anatomically with better hearing potential and no cavity — but a higher rate of residual and recurrent disease, so it commits the patient to a second-look procedure or diffusion-weighted MRI surveillance
• The choice depends on the extent of disease, the state of the other ear, the reliability of follow-up, the presence of a fistula or complication, and the surgeon’s experience. Where follow-up is uncertain, canal wall down is safer — a genuine consideration in much of India
• Radical mastoidectomy, which exteriorises the middle ear entirely and sacrifices hearing, is now reserved for extensive disease or malignancy
• All patients need long-term follow-up, for residual disease, recurrence and cavity problems
• It is not cholesterol, not fat and not a tumour; it is skin in the wrong place, and saying so shows understanding
• Bone destruction is enzymatic, not merely pressure, with collagenase and osteoclast activation from the perimatrix
• Infection accelerates bone erosion markedly, which is why a discharging cholesteatoma advances faster than a dry one
• The pars flaccida gives way first because it lacks the fibrous middle layer.