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- Abstract 文献概要
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- 参考文献 Reference
Ⅰ.はじめに
Segmental arterial mediolysis(SAM)は,1976年にSlavinらによって提唱された,動脈に発生する非炎症性・非動脈硬化性の稀な変性疾患である.SAMは主として,腹腔内の筋性動脈に分節性に中膜融解を来すことで動脈瘤を形成し,動脈瘤破裂による突然の腹腔内出血を生じる病態であり,頭蓋内動脈瘤の合併も報告されている20,21).今回われわれは,くも膜下出血後急性期に右胃大網動脈破裂による腹腔内出血からショック状態となり,予後不良となった症例を経験したので文献的考察を加えて報告する.
Segmental arterial mediolysis(SAM)is a rare non-inflammatory and non-atherosclerotic arteriopathy associated with the occurrence of multiple aneurysms such as intracranial and intraperitoneal aneurysms.
We report a case of intraperitoneal hemorrhage that occurred during the acute stage of subarachnoid hemorrhage(SAH). An 82-year-old woman presented with a sudden onset of loss of consciousness with a diagnosis of SAH. Digital subtraction angiography demonstrated two consecutive vertebral artery-posterior inferior cerebellar artery aneurysms. The larger aneurysm, which seemed to be ruptured, was successfully treated by coil embolization. On the 9th day after the onset of SAH, she developed aphasia secondary to the cerebral vasospasm. After selective intra-arterial infusion of fasudil hydrochloride, she was observed to maintain elevated systolic blood pressure. Her aphasia improved;however, on the 14th day, she suddenly developed hemorrhagic shock. An abdominal computed tomography scan demonstrated intraperitoneal hemorrhage secondary to a ruptured fusiform aneurysm of the right gastroepiploic artery. The lesion was successfully treated by coil embolization, although she became bedridden. Although a histopathological examination was not performed, her clinical, radiological, and serological presentation met the criteria of the clinical diagnosis of SAM. Elevated systolic blood pressure and excessive release of catecholamines in the acute stage of SAH might have caused the intraperitoneal hemorrhage.
Non-saccular ruptured intracranial aneurysms should be considered among the differential diagnoses of SAM. In such cases, identifying and monitoring intraperitoneal aneurysms might be useful for earlier diagnosis and treatment of SAM, especially in the acute stage after SAH.

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