Kashio Akinori, Suzuki Mitsuya
Department of Otolaryngology, Tokyo Metropolitan Police Hospital, Tokyo, Japan.
Acta Otolaryngol Suppl. 2007 Dec(559):168-71. doi: 10.1080/03655230701600343.
We report the case of a 39-year-old woman with a left side meningioma, suffering from bilateral sensorineural hearing loss, who recovered audiometric hearing in both ears after surgery. A preoperative pure tone audiogram (PTA) revealed a bilateral sensorineural hearing loss. Several examinations for sensorineural hearing loss indicated cochlear and retrocochlear hearing loss in the left ear and cochlear hearing loss in the right ear. After the operation, bilateral hearing loss due to a left posterior fossa meningioma gradually improved. One year after surgery, with the exception of hearing at frequencies of 4 and 8 kHz in the left ear, the postoperative audiogram had improved to an almost normal level. We speculate that hearing loss in the left ear may have been induced by the indirect compression of the cochlear nerve caused by the tumor's edema, whereas that in the right ear may have resulted from changes in CSF pressure caused by the mass effects of the tumor.
我们报告了一例39岁患有左侧脑膜瘤的女性病例，该患者患有双侧感音神经性听力损失，术后双耳听力在听力图检查中恢复。术前纯音听力图（PTA）显示双侧感音神经性听力损失。多项感音神经性听力损失检查表明左耳存在耳蜗性和蜗后性听力损失，右耳存在耳蜗性听力损失。手术后，由左后颅窝脑膜瘤引起的双侧听力损失逐渐改善。术后一年，除左耳4kHz和8kHz频率的听力外，听力图已改善至几乎正常水平。我们推测左耳听力损失可能是由肿瘤水肿对耳蜗神经的间接压迫所致，而右耳听力损失可能是由肿瘤占位效应引起的脑脊液压力变化所致。
