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ENT · Otology: theory of cholesteatoma
Sample itemWhich theory best explains the commonest type of acquired cholesteatoma in the attic?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
C. Invagination of a retraction pocket of the pars flaccida
Negative middle ear pressure from tubal dysfunction draws the pars flaccida inward, forming a retraction pocket whose keratin cannot clear. This is the most widely accepted theory. Congenital cholesteatoma arises from embryonic epithelial rests.
Option by option
A. Epithelial rests from embryonic life
Embryonic rests explain congenital cholesteatoma.
B. Metaplasia of middle ear mucosa
Metaplasia is a less accepted theory.
C. Invagination of a retraction pocket of the pars flaccida (correct)
Correct. Retraction pocket invagination is the commonest mechanism.
D. Basal cell hyperplasia only
Basal cell hyperplasia describes the papillary ingrowth theory, a minor theory.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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