A cholesteatoma is a type of cyst found in the middle ear behind the eardrum. Cholesteatoma is a noncancerous tumor that forms when the skin of a punctured eardrum grows through the hole in the middle ear.

Regions of the Ear
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Cholesteatomas are most often caused by:

  • Ear infections
  • Congenital defects
  • A poorly functioning eustachian tube