External ear canal cholesteatoma with contralateral mastoid tegmen dehiscence of possible traumatic origin.

Dimitar Pazardzhikliev
External ear canal cholesteatoma is a rare entity with an approximate reported incidence of 1 in 1000 new otologic patients. On the other hand autopsy studies suggest that single defects in the tegmen of the temporal bone occur in 15% to 34% of specimens. Both conditions may share common traumatic[for full text, please go to the a.m. URL]