Large AVM in right mid and superior perietal region with arterial feeders from right middle cerebral and part of anterior cerebral arteries and draining into superior sagital sinus and adjacent cortical veins.
An arteriovenous malformation (AVM) is a tangled cluster of vessels, typically located supratentorially, in which arteries connect directly to veins with no intervening capillary bed. A 1988 study of more than 500 patients showed that the core, or nidus, of a compact AVM was from 2-6 cm in diameter in 77%.AVMs account for approximately 11% of cerebrovascular malformations. AVMs are more likely than other types of vascular malformations to be clinically symptomatic. AVMs are categorized by their blood supply. Pial or parenchymal AVMs are supplied by the internal carotid or vertebral circulation; dural AVMs, by the external carotid circulation; and mixed AVMs, by both. A pediatric variant of AVM is the vein-of-Galen aneurysm, in which an AVM drains to and dilates the great vein of Galen.
The Spetzler and Martin grading system attempts to predict risk of surgical morbidity and mortality by assigning points to an AVM on the basis of its size, the eloquence of the adjacent brain, and the pattern of venous drainage.
You can find more information on this topic here
No comments:
Post a Comment