Abstract
Facial nerve neurilemmoma is a slow-growing tumor. It is surgically treatable without difficulty when detected at an early stage. A review of Japanese literature revealed 31 cases (13 males and 18 females). Nine more cases are reported here. Clinical symptoms and signs depend on the site of origin and on the area of expansion. Of all the tumors reported in the Japanese literature, 12 originated in the horizontal portion of the facial canal, while 9 originated in the vertical portion. Facial nerve paralysis, usually the initial symptom, occurs gradually, but it sometimes occurs suddenly with or without repetition. Facial spasm may precede paralysis. In the early stage, facial nerve neurilemmoma is often misdiagnosed as Bell's palsy. As the tumor grows, a variety of symptoms appears such as hearing loss, vertigo, otorrhea due to secondary infection, etc. Thus, it is sometimes difficult to differentiate advanced facial nerve neurilemmoma from acoustic tumor, glomus jugulare tumor, cholesteatoma or even intracranial tumor. In conclusion, early diagnosis, prompt surgical removal and nerve graft are the ideal course in the treatment of facial nerve neurilemmoma.
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