Cholesteatoma

Background

• Commonly secondary to Eustachian tube dysfunction, which retracts TM
• A retraction pocket forms and desquamating skin cells are trapped
  • Usually in "attic" involving pars flaccida
  • Their accumulation results in a slowly expanding mass
  • Sac of dead skin cells growing in middle ear on out of surface of TM
• Can destroy ossicles and expand into mastoid (rarely, intracranially)
• Often chronically infected with intermittent drainage

Differential Diagnosis

Ear Diagnoses

External

• Auricular hematoma
• Auricular perichondritis
• Cholesteatoma
• Contact dermatitis
• Ear foreign body
• Herpes zoster oticus (Ramsay Hunt syndrome)
• Malignant otitis externa
• Otitis externa
• Otomycosis
• Tympanic membrane rupture
  • Otic barotrauma

Internal

• Acute otitis media
  • Bullous myringitis
• Chronic otitis media
• Mastoiditis

Inner/vestibular

• Labyrinthitis, vestibular neuritis
• Meniere's disease
• Sudden sensorineural hearing loss