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I.はじめに
Dandy-Walker症候群(DWS)は小脳虫部の形成異常,嚢腫様に拡大した第4脳室を特徴とする脳の発生異常である3,10).通常水頭症を伴い乳児期に発症する事が多い4).成人にて発症するもの,あるいは成人まで症状を認めず偶然見つかるものは稀である6,11).今回われわれは成人に至るまで無症候で経過し,小脳出血を併発したDWSを経験したので報告する.
A case of asymptomatic Dandy-Walker syndrome (DWS) complicated by cerebellar hemorrhage is reported. A 65 year-old man was hospitalized for investigation and treatment of disturbance of consciousness.
CT scan and MRI showed a large hematoma in the posterior fossa cyst. Postoperative CT scan and MRI revealed the DWS and cerebellar hemorrhage on the left side. This patient had no symptom until 65 years of age, in spite of having DWS. There has been no such case reported in the literature to our knowledge.
Derangement of secretion and absorption of cerebrospinal fluid seem to have been the cause of late-onset symptoms after a long well balanced symptom-free period.
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