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Cerebral Dural Arteriovenous Fistulas:Clin & Angiographic Correl with a Revised Class of Venous Drainage Radiology 194:671-680, Cognard,C.,et al, 1995 See this aricle in Pubmed Article Abstract Type I dural AVFs had a benign course.In type II,reflux into the sinus induced intracranial hypertension in 20%of cases,and reflux into cortical veins induced hemorrhage in 10%.Hemorrhage was present in 40%of cases of type III dural AVFs and 65%of type IV.Type V produced progressive myelopathy in 50%of cases.This classification provides useful data for determination of the risk with each dural AVF and enables decision-making about the appropriate therapy.

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