A 63-year-old woman presented with a ruptured aneurysm which apparently spontaneously thrombosed. She was admitted after sudden onset of severe headache. Computed tomography (CT) demonstrated subarachnoid hemorrhage (SAH) in the pontine and interpeduncular cisterns. Initial threedimensional CT (3D-CT) angiography revealed an aneurysm (diameter, 9 mm) near the origin of the left superior cerebellar artery. However, angiography 3 hours later failed to show the aneurysm. Total thrombosis was thought to have occurred in the aneurysm. The patient returned home with no deficit 1 month after admission. T 1 -and T 2 -weighted magnetic resonance imaging 75 days after the SAH demonstrated the thrombosed aneurysm as an isointense mass lesion. 3D-CT angiography showed no recanalization of the aneurysm 9 months after the SAH.
Fenestrae were found in freeze-fractured cisternae of the Golgi apparatus and endoplasmic reticulum of glioblastoma, oligodendroglioma, ependymoma, medulloblastoma, medulloepithelioma, meningioma, cerebellar sarcoma, hemangioblastoma, and chromophobe adenoma. They were about 200--400 A in diameter and often diffusely distributed or concentrated in groups in Golgi cisternae, while they were around 300--600 A in size and scattered in distribution in cisternae of endoplasmic reticulum. They appeared as conical protrusions or circular broken-off necks of face A and as circular holes on face B in tangential fractures, and as several constrictions of cisternae in cross fractures.
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