硬性内視鏡を併用し聴力保存手術を行った迷路下型錐体部真珠腫の1例
2003 年 13 巻 3 号 p. 219-222
詳細
2003 年 13 巻 3 号 p. 219-222
A 29-year-old woman underwent an operation for removal of infralabyrinthine petrous bone cholesteatoma. Her inner ear function was successfully preserved by introducing a rigid endoscope usually used for endonasal sinus surgery.
The patient complained of dizziness and headache 9 years ago and CT examination revealed a tumor in her left petrous bone. She had been observed without any major symptoms for 8 years. However facial paralysis and hearing loss on the left side suddenly occurred last year, which recovered after one-week daily injections of steroid. The preoperative inner ear function was minimally impaired with 10dB hearing loss compared with the healthy side. Facial paralysis was not observed. The operation was conducted under the transmastoid approach using a rigid endoscope, which helped us to get a full operative view without destroying the bony labyrinth such as the semi-circular canals, cochlea and the facial canal. The cholesteatoma was successfully removed and the inner ear function was completely preserved. We concluded that the rigid endoscope was useful for the removal of petrous bone cholesteatoma of the infralabyrinthine type.
