[A case of arteriovenous communication between external and internal carotid arteries and the sinus after removal of the meningioma (author's transl)].

A 60-year-old man was admitted with anosmia, memory disturbance and disorientation in 1971. He was diagnosed the left olfactory groove meningioma and received the removal of the tumor after ligation of the left external carotid artery. Over the following two years he was admitted again with progressive memory disturbance and mental disorder in Aug. '73. Physical examination disclosed no abnormalities except for slight hypertention. His CSF pressure was 120 mm H2O and pneumoencephalograms showed marked dilatation of the lateral ventricles. Right carotid angiography revealed the right olfactory groove meningioma which was receiving a rich circulation from the branches of right ophthalmic artery. And right selective external arteriography showed an arteriovenous communication between the occipital artery and the transverse sinus. Contrast medium flowed to the left transverse sinus. Left internal carotid arteriography showed an anomalous arteriovenous communication between the tentorial branch (Bernasconi-Cassinari artery) of the internal carotid artery and sigmoid sinus. Further left vertebral arteriography revealed another arteriovenous communication between the left occipital artery anastomosed with vertebral artery and the transverse sinus. An operation for the right olfactory groove meningioma was made in Sep. '73. Some considerations on the pathogenesis of developement of these arteriovenous communications were discussed.