arteriovenous malformation
Abnormal direct connection between arteries and veins, bypassing normal capillary bed.
Full Definition
An arteriovenous malformation (AVM) is a congenital vascular anomaly characterized by abnormal direct connections between arteries and veins without an intervening capillary bed, creating a high-flow, low-resistance circuit. These lesions can occur anywhere in the body but are particularly significant when involving the brain, spinal cord, or extremities. In vascular medicine documentation, AVMs require detailed description of their location, size, flow characteristics, and associated complications, as treatment planning depends heavily on accurate anatomical and hemodynamic assessment.
Usage
Usage note: Distinguish from arteriovenous fistula, which may be acquired; AVM is typically congenital.
In Context
- "The cerebral arteriovenous malformation was classified as Spetzler-Martin grade III based on size and location." — Neurovascular assessment report
- "Endovascular embolization was performed to reduce flow through the peripheral arteriovenous malformation." — Interventional procedure note