Cholesteatoma: Causes, Risk Factors, Pathogenesis & Prevention

Cholesteatoma is a keratinizing squamous epithelium cyst in the middle ear/mastoid — not a true neoplasm but locally destructive.

Pathogenesis (Unified Theory)

1. Eustachian Tube Dysfunction (ETD): Chronic obstruction → negative middle ear pressure.
2. Tympanic Membrane Retraction: Pars flaccida (Shrapnell's membrane) or pars tensa retracts medially.
3. Retraction Pocket Formation: Epithelium migrates into pocket; keratin accumulates.
4. Enclosed Keratin Sac: Becomes cholesteatoma; expands by epithelial proliferation + keratin deposition.
5. Bone Erosion: Enzymatic (proteases), pressure necrosis, osteoclastic activation → ossicles, scutum, facial nerve canal, tegmen, labyrinth.

Risk Factors

• Recurrent/Chronic Otitis Media: Especially with perforation.
• Craniofacial Syndromes: Cleft palate, Down, Treacher Collins → ETD.
• Prior Ear Surgery: Tympanoplasty, ventilation tubes (iatrogenic pocket).
• Genetic Predisposition: Familial clustering; collagen disorders.
• Congenital Cholesteatoma: Epithelial rest (rare, 2–4% of cases) — no prior infection.

Clinical Presentation

• Chronic otorrhea (foul-smelling, scant)
• Conductive hearing loss (ossicular erosion)
• Retraction pocket/pearly mass on otoscopy
• Advanced: vertigo (labyrinthine fistula), facial palsy, intracranial complications

Prevention Strategies

• Aggressive ETD management: nasal steroids, autoinflation (Otovent), tympanostomy tubes for recurrent OME.
• Prompt treatment of AOM/OME; avoid repeated perforations.
• Regular otoscopic surveillance in high-risk children (cleft palate, prior tubes).
• Patient education: no Q-tips, water precautions if TM perforation.

Treatment

Surgical (mastoidectomy ± tympanoplasty) — only definitive cure. Goal: eradicate disease, reconstruct hearing, prevent recurrence. Staged (canal wall up vs. down) based on extent.

Early referral to otologist for persistent otorrhea or retraction pocket is crucial.