Makoto Hayano

Aneurysms associated with fenestrated anterior cerebral arteries. Report of four cases and review of the literature

Four cases of aneurysms associated with a fenestrated anterior cerebral artery are presented. The combination of aneurysms and fenestration of the anterior cerebral artery is rare, and nine cases including ours have been reported. In all cases fenestrations were found within the distal two-thirds of the horizontal portion of the anterior cerebral artery. It may be presumed that fenestration of the anterior cerebral artery is the remnant of the plexiform anastomosis in the fetal stage, especially between the anterior cerebral artery and the primitive olfactory artery.

Meningioma in the tela choroidea of the third ventricle: CT and angiographic correlations

SummaryA meningioma of the tela choroidea of the third ventricle is rare. CT and detailed analysis of angiographic findings in such a case are presented. CT facilitated the detection of rough location of the tumor and the prediction of its histological features. Carotid and vertebral angiographies were utilized in detailing the three-dimensional, gross anatomical relationship between tumor and the surrounding brain structures. Vertebral angiography also contributed to predicting the histology of the tumor.

Basilar artery occlusion after superficial temporal artery-superior cerebellar artery anastomosis

Superficial temporal artery-superior cerebellar artery anastomosis for basilar artery stenosis was performed in a patient who had experienced recurrent nonhemispheric symptoms, and whose angiogram revealed a midbasilar stenosis. Four months after the operation he was readmitted to our hospital complaining of transient motor weakness and numbness of the left extremities. No neurological deficit was found on admission, but 1 hour later the left-sided hemiparesis occurred again and progressed. On the angiograms the upper basilar system was visualized via the superficial temporal artery, and the midbasilar artery was occluded. This conversion seemed to be a natural course rather than the influence of the hemodynamic change after the operation.