title: Cystic arteriovenous malformation. A case report.
abstract: The authors report on a rare case of arteriovenous malformation (AVM) associated with cyst formation. Only five similar cases have been reported. CT findings of the cyst are divided into two types: 1) slit-like low density and 2) round one. Three patients showing slit-like cysts had experienced sudden severe headaches, probably due to haemorrhage. In contrast, two patients showing round cystic lesions had not experienced such sudden headaches and they revealed a nodule in the cyst at surgery. These facts suggest that there may be two different mechanisms for cyst formation in AVM's: haemorrhage and exudation. Slit-like cysts may result from old haemorrhage from the AVM nidus. Round cystic lesions may be due to exudation from the AVM nidus.
authors.affiliation: Department of Neurological Surgery, Wakayama Medical College, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Itakura
authors.forename: K
authors.initials: K
authors.lastname: Takifuji
authors.forename: F
authors.initials: F
authors.lastname: Ozaki
authors.forename: K
authors.initials: K
authors.lastname: Itatani
authors.forename: T
authors.initials: T
authors.lastname: Nishiguchi
authors.forename: S
authors.initials: S
authors.lastname: Hayashi
authors.forename: N
authors.initials: N
authors.lastname: Komai
mesh_terms: D000328:Adult; D001927:Brain Diseases / Q000150:complications* / Q000000981:diagnostic imaging / Q000601:surgery; D003560:Cysts / Q000150:complications* / Q000000981:diagnostic imaging / Q000601:surgery; D005260:Female; D006801:Humans; D002538:Intracranial Arteriovenous Malformations / Q000150:complications* / Q000000981:diagnostic imaging / Q000601:surgery; D011859:Radiography