AVM
Also written as: AVM — Arteriovenous Malformation
Arteriovenous malformation, an abnormal connection between arteries and veins that bypasses normal capillary networks.
Full Definition
An arteriovenous malformation (AVM) is a congenital vascular anomaly characterized by abnormal direct connections between arteries and veins without an intervening normal capillary bed. This creates a high-flow, low-resistance circuit that can lead to various complications including hemorrhage, steal phenomenon affecting surrounding tissues, and progressive enlargement. AVMs can occur in various locations but are most concerning when present in the brain, where they carry significant risks of intracranial hemorrhage, seizures, and neurological deficits. Treatment options include surgical resection, endovascular embolization, stereotactic radiosurgery, or combinations of these approaches depending on the lesion's size, location, and angioarchitecture.
Usage
Usage note: Distinguish from AVF (arteriovenous fistula), which is typically acquired.
In Context
- "The cerebral AVM was successfully treated with staged endovascular embolization." — Neurointerventional procedure report
- "Pulmonary AVM screening is recommended for patients with hereditary hemorrhagic telangiectasia." — Genetic counseling report