合併病型を持たない中耳コレステリン肉芽腫症の聴力像からの検討
1990 年 17 巻 2 号 p. 39-46
詳細
1990 年 17 巻 2 号 p. 39-46
In order to detect several worsening factors in hearing after operation in cases of cholesterin granuloma, 41 surgically treated cases of simple cholesterin granuloma were selected in this study. The following five characteristics were considered to have given the worsening influences to postoperative hearing.
1) Age at tympanoplasty was over 35 years old.
2) The duration of the illness was over 15 years.
3) The case had otorrhea within a month before operation.
4) The case had the perforated ear drum before operation.
5) A large amount of granulation tissues surrounding the ear ossicles was observed during surgery.
It is assumed that postoperative hearing should be affected by both the location and volume of granulations directly, and by the duration of the illness, aural discharge and perforation of the tympanic membrane soon before operation, indirectly.
