術後性乳突部真珠腫について
1998 年 8 巻 3 号 p. 175-178
詳細
1998 年 8 巻 3 号 p. 175-178
Canal down tympanoplasty for middle ear cholesteatoma with mastoid obliteration was performed in 787 ears at Tokai University Hospital between April 1975 and April 1992. These ears were followed up more than five ears, and recurrent cholesteatoma occured in twelve ears (1.5%). Among them we experienced four cases had normal aeration in the tympanic cavity and the epitympanum. In these cases, the cholesteatoma matrix invaded into the mastoid from the posterior shallow wall of the external ear canal.
These findings suggested that the mastoid cholesteatoma was caused by the negative pressure in the mastoid and the bony blockage of the aditus because of the mastoid obliteration technique in the initial operation, not by the residual cholesteatoma.
