arteriovenous malformation
Pronunciation: ar-teer-ee-oh-VEE-nus mal-for-MAY-shun
Also written as: AVM — arteriovenous malformation
Abnormal vascular connection between arteries and veins bypassing normal capillary circulation.
Full Definition
An arteriovenous malformation (AVM) is a congenital vascular anomaly characterized by direct connections between arteries and veins without an intervening capillary bed. Brain AVMs consist of a central nidus (tangle of abnormal vessels), feeding arteries, and draining veins. These lesions carry risk of hemorrhage, seizures, and neurological deficits. Treatment options include surgical resection, endovascular embolization, stereotactic radiosurgery, or combination approaches depending on the AVM's characteristics and location.
Usage
Usage note: Often graded using the Spetzler-Martin classification system.
In Context
- "The Spetzler-Martin Grade III arteriovenous malformation was deemed suitable for surgical resection." — vascular neurosurgery consultation
- "Angiography revealed a compact arteriovenous malformation with single feeding vessel." — radiology report