Ozmen Omer Afsin, Sarac Sarp, Sennaroglu Levent, Turan Ergin
Department of Otolaryngology Head and Neck Surgery, Hacettepe University Faculty of Medicine, Yenisehir, Ankara, Turkey.
Otol Neurotol. 2007 Apr;28(3):345-7. doi: 10.1097/MAO.0b013e31803261a0.
To describe a unilateral conductive hearing loss caused by restriction of the movements of malleus and incus due to chorda tympani in a bony sheath.
A 23-year-old man with a stable mild conductive hearing loss in the left ear and mild sensorineural hearing loss in the right ear.
An exploratory tympanotomy was performed.
Immobility of the ossicles due to a bony structure, which was found to be chorda tympani encircled in a bony sheath. Ossicular system regained its mobility with the severance of the chorda tympani.
Hearing was improved both subjectively and audiographically.
This is the second case of chorda tympani with a bony sheath and the first case of this pathologic finding affecting both malleus and incus. Bony sheathed chorda tympani is considered to be a congenital anomaly of the chorda tympani that causes incudomalleolar fixation and behaves as posterior bony bars.
描述一例因鼓索神经在骨性鞘内限制锤骨和砧骨运动而导致的单侧传导性听力损失。
一名23岁男性，左耳有稳定的轻度传导性听力损失，右耳有轻度感音神经性听力损失。
进行了探查性鼓室切开术。
由于骨性结构导致听小骨活动受限，发现是鼓索神经被骨性鞘包裹。切断鼓索神经后听骨系统恢复了活动。
主观听力和听力图检查均显示听力有所改善。
这是第二例鼓索神经有骨性鞘的病例，也是该病理发现影响锤骨和砧骨的首例病例。骨性鞘包裹的鼓索神经被认为是鼓索神经的一种先天性异常，可导致砧镫关节固定，并表现为后骨性杆。
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