Method 9 cases of cholesteatoma manifested by MRI and CT, among them, 8 cases located ventral side of brain stem, 1 case in left side of brain stem.

• 方法经磁共振成像（MRI）和计算机体层摄影（CT）及手术证实的胆脂瘤9例，位于脑干腹侧面8例，脑干左侧1例。