Surgical Findings to Differentiate Between Facial Nerve Schwannoma and Vestibular Schwannoma
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Objectives. Facial nerve schwannomas may be misdiagnosed as vestibular schwannomas (VSs) if the tumor is confined to the internal auditory canal (IAC) without involvement the geniculated ganglion or labyrinthine segment of facial nerve. Because facial nerve schwannomas may be misdiagnosed as VSs, we investigated the differences between the two. Methods. The study included 187 patients with a preoperative diagnosis of VS. Of these, six were diagnosed with facial nerve schwannomas during surgery. We reviewed the preoperative evaluations and surgical findings of facial nerve schwan- nomas mimicking VSs. Results. No useful preoperative predictors are available for facial nerve schwannomas mimicking VSs. Facial nerve schwan- nomas are usually confined to the IAC. After opening the dura of the IAC, a facial nerve schwannoma can be diag- nosed after identifying a normal-appearing nerve located lateral to the tumor. When this was the case, we performed facial nerve preservation surgery or decompression. Conclusion. Facial nerve schwannomas can be differentiated from VSs by identifying specific findings during surgery.
Abstract
Objectives. Facial nerve schwannomas may be misdiagnosed as vestibular schwannomas (VSs) if the tumor is confined to the internal auditory canal (IAC) without involvement the geniculated ganglion or labyrinthine segment of facial nerve. Because facial nerve schwannomas may be misdiagnosed as VSs, we investigated the differences between the two. Methods. The study included 187 patients with a preoperative diagnosis of VS. Of these, six were diagnosed with facial nerve schwannomas during surgery. We reviewed the preoperative evaluations and surgical findings of facial nerve schwan- nomas mimicking VSs. Results. No useful preoperative predictors are available for facial nerve schwannomas mimicking VSs. Facial nerve schwan- nomas are usually confined to the IAC. After opening the dura of the IAC, a facial nerve schwannoma can be diag- nosed after identifying a normal-appearing nerve located lateral to the tumor. When this was the case, we performed facial nerve preservation surgery or decompression. Conclusion. Facial nerve schwannomas can be differentiated from VSs by identifying specific findings during surgery.
참고문헌 (14)
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