術後に骨導聴力の著明な改善をみた真珠腫による迷路瘻孔—2症例の報告

Labyrinthine Fistula due to Cholesteatoma and Postoperative Improvement of Bone Conduction: A Report of Two Cases

I．はじめに

　突発性難聴を代表とする一部の疾患を除いて骨導聴力の改善は一般的に難しい。

　われわれは術前すでに高度に骨導聴力の低下した迷路瘻孔を合併した真珠腫性中耳炎の2症例に，術後大幅な骨導聴力の改善をみた。

　Two cases of labyrinthine fistulae due to extensive cholesteatoma resulted in remarkable improvement of bone conduction (more than 30dB) by ear surgery. In each case, a fistula of more than two millimeters in length was found at the lateral semicircular canal and membraneous labyrinthine wall was exposed when the cholesteatoma membrane was removed.

　The literature was reviewed, and the mechanism of the improvement of bone conduction in these cases was discussed.