title: Posterior cranial fossa dural arteriovenous malformation with a varix mimicking a thrombosed aneurysm: case report.
abstract: Dural arteriovenous malformations (AVMs) in the posterior cranial fossa are relatively infrequent. Intradural haemorrhage is one of their specific complications. Angiographic demonstration of varices or aneurysmal structures is one of the hallmarks of severe cases. We report a patient with posterior cranial fossa dural AVM associated with a varix mimicking a thrombosed aneurysm on CT and MRI. Internal carotid and vertebral angiography failed to demonstrate an aneurysm, but external carotid injection revealed a dural AVM affecting the sigmoid sinus, and a varix. The AVM was completely eliminated by embolization. When a dural AVM is suspected clinically selective angiography should be performed to confirm the diagnosis even when CT or MRI do not show dilated vessels.
authors.affiliation: Department of Radiology, University of Tokyo, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Machida
authors.forename: N
authors.initials: N
authors.lastname: Hayashi
authors.forename: Y
authors.initials: Y
authors.lastname: Sasaki
authors.forename: S
authors.initials: S
authors.lastname: Aoki
authors.forename: I
authors.initials: I
authors.lastname: Shirouzu
authors.forename: Y
authors.initials: Y
authors.lastname: Sasaki
authors.forename: K
authors.initials: K
authors.lastname: Inoue
authors.forename: T
authors.initials: T
authors.lastname: Maehara
mesh_terms: D002533:Cerebral Angiography; D003388:Cranial Fossa, Posterior; D003937:Diagnosis, Differential; D004388:Dura Mater / Q000098:blood supply*; D006801:Humans; D002532:Intracranial Aneurysm / Q000175:diagnosis* / Q000000981:diagnostic imaging; D002538:Intracranial Arteriovenous Malformations / Q000175:diagnosis* / Q000000981:diagnostic imaging; D002542:Intracranial Embolism and Thrombosis / Q000175:diagnosis* / Q000000981:diagnostic imaging; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D014057:Tomography, X-Ray Computed; D014648:Varicose Veins / Q000175:diagnosis* / Q000000981:diagnostic imaging