THE VESTIBULAR evaluation of the patient with an acoustic tumor has three aspects: (1) subjective symptoms, (2) spontaneous vestibular signs, and (3) vestibular function sensitivity and responsiveness.
The majority of all eighth nerve tumors are neurinomas or neurofibromas. There is evidence that the origin is often the perineurium (Schwann cells) of the vestibular branch of the eighth nerve. Vestibular participation in the early symptoms and manifestations, therefore, can be expected. There is, however, neither uniformity nor consistency in the symptoms and findings. The reason for this inconsistency may be the same as it is for practically all the symptoms and findings of the other cranial nerve (fifth, sixth, seventh) involvement. The tumor may be a very slowly or more rapidly growing mass. It has an irritating and paralytic effect upon the individual neurons and nerve fibers. The space occupying effect upon the first postganglionic vestibular neuron decreases function sensitivity, but
Torok N. Vestibular Evaluation of the Acoustic Tumor. Arch Otolaryngol. 1969;89(2):290–293. doi:10.1001/archotol.1969.00770020292011
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