[ XXXX presented with fourth @entity548 : report of 2 cases].

@entity1 @entity548 @entity438 @entity391 @entity51 @entity439 @entity1410 @entity5487 @entity10 @entity1756
Two cases involving a @entity1756 in a choroidal branch of the posterior @entity5487 are reported here. Case 1: A 61-year-old @entity1 was admitted after an episode of severe @entity10 with persistent @entity391 . A CT revealed an @entity548 within the fourth ventricle. An angiography showed an aneurysmal shadow in the choroidal artery branching from the telovelotonsillar segment of the distal posterior @entity5487 (PICA). The operation disclosed a @entity439 in the choroidal artery which was successfully trapped using Yasargil's mini-clips. The postoperative course was uneventful and the @entity1 was discharged without any @entity51 . Case 2: A 64-year-old @entity1 became unresponsive after complaining of a severe @entity10 . On admission, she was semicomatose with positive bilateral Babinski's sign. A CT scan showed that the fourth and third ventricles were packed and dilated by a massive @entity1410 . An angiography demonstrated an aneurysmal shadow in a branch from the PICA with an occlusion of the right vertebral artery. Furthermore, the left vertebral artery was also occluded and the basilar artery was fed by collateral circulation. The @entity1 underwent an operation immediately. The @entity439 was resected after ligation. Her postoperative course was satisfactory. She was able to go home without @entity51 . There has been only one article about "pure" @entity438 , reported by Uranishi, et. al in 1994. They suggested that the pathogenesis of this lesion could be due to hemodynamic stress. Our two cases also present the same characteristics, in the shape of the @entity439 as well as in the anomalous structures in the posterior circulation. Our results offer further evidence concerning the pathogenesis of that type of lesion.
