title: Cryptic arteriovenous malformation of the choroid plexus of the fourth ventricle--case report.
abstract: A 54-year-old female presented with a cryptic arteriovenous malformation (AVM) of the choroid plexus of the fourth ventricle causing intraventricular hemorrhage. Computed tomography and magnetic resonance imaging disclosed the lesion near the fourth ventricle, but bilateral vertebral angiograms showed no abnormalities. The preoperative diagnosis was cavernous angioma. The mass was removed completely, and histological examination demonstrated an AVM of the choroid plexus. Vascular malformations of the choroid plexus of the fourth ventricle are extremely rare. The possibility of this lesion being the cause of primary intraventricular hemorrhage of unknown origin should always be considered.
authors.affiliation: Department of Neurosurgery, Tokyo Medical and Dental University School of Medicine.
authors.forename: M
authors.initials: M
authors.lastname: Tamaki
authors.forename: K
authors.initials: K
authors.lastname: Ohno
authors.forename: T
authors.initials: T
authors.lastname: Asano
authors.forename: Y
authors.initials: Y
authors.lastname: Niimi
authors.forename: T
authors.initials: T
authors.lastname: Uchihara
authors.forename: K
authors.initials: K
authors.lastname: Hirakawa
mesh_terms: D002533:Cerebral Angiography; D002552:Cerebral Ventricles / Q000473:pathology / Q000601:surgery*; D002831:Choroid Plexus / Q000098:blood supply* / Q000473:pathology / Q000601:surgery; D005260:Female; D006801:Humans; D002538:Intracranial Arteriovenous Malformations / Q000175:diagnosis / Q000473:pathology / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D014057:Tomography, X-Ray Computed