[Intracranial osteochondroma -case report (author's transl)].

Intracranial osteochondroma or chondroma is rarely seen. A case of osteochondroma in the right middle fossa was presented with a review of twenty-six cases reported in Japan. A 41-year-old male was admitted to Nippon Medical School hospital with five years history of double vision. Neurological examination revealed right abducens palsy and a slight degree of ipsilateral exophthalmos. Craniogram showed a mottled calcification without definite bone destruction. EMI scan showed an irregularly shaped high density area, which was not enhanced after contrast media infusion. The bone scintigraphy employing 99mTec-MDP revealed an abnormal uptake in the right orbital region and proved to be a valuable technique for the detection of osteochondroma. The tumor was subtotally removed by a right frontotemporal craniotomy. Histologically this tumor was confirmed to be osteochondroma. The patient was discharged about one month after operation and then returned to work.