During the surgical excision of cholesteatoma, it is sometimes necessary to produce a mastoid cavity to excise all of the cholesteatoma extending into the mastoid bone. A mastoid cavity is found posteriorly in the ear canal and resembles a widening of the posterosuperior part of the canal. The cavity may become filled with wax or become infected.
An atticotomy that has healed nicely and is self-cleaning. The entire malleus can be seen, including the head. The tympanic membrane is retracted on to the oval window and the facial nerve.