(A) Axial CT of a small congential cholesteatoma near the eustachian tube orifice (arrows). (B) Axial CT of moderate-sized congenital cholesteatoma (arrows) deep to the ossicles in the attic. (C) Axial CT of a large cholesteatoma of the mastoid. Arrows outline area of destruction. Asterix shows a breach of the mastoid cortex by infection with subperiosteal abscess.
