The following case summaries are illustrative of the points considered. Case 1.—Summary.—There was facial numbness eight months previous to surgery. Partial removal; middle fossa approach. No evidence ofrecurrence in three years. History.—This 44-year-old fireman was first examined in February, 1961. Eight months prior to examination, the patient noted a numbness at the corner of the left side of the mouth. Two months later, he noted left tinnitus. One month prior to his examination, he developed intermittent left headaches. At no time was hearing loss or unsteadiness present. Examination.—The neurological examination was normal except for involvement of the fifth and eighth cranial nerves. The fifth nerve showed diminished sensation over the distribution of the left mandibular branch and diminished left corneal sensation. Eighth Nerve: PB's were 94%; Békésy, not performed; SISI, not performed; TD, negative at 1,000 and 4,000 cps. Vestibular, Caloric Test: Right ear was normal; left, markedly diminished response