Presentation of CaseA 65-year-old man was admitted to the hospital because of a large mass that invaded the base of the right side of the skull.The patient was well until 18 months earlier, when he experienced painless horizontal diplopia. He consulted an ophthalmologist, who found right hypertropia. On a random determination the blood glucose level was reported to be normal. The diplopia resolved spontaneously after four days, and the patient failed to return for a planned visual-field examination. He then became lost to follow-up examination until nine months before entry, when painless horizontal diplopia recurred. He returned to . . .
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Cabot et al. (1992) studied this question.
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