dural arteriovenous fistula
Also written as: DAVF — dural arteriovenous fistula
Abnormal connection between dural arteries and venous sinuses or cortical veins, potentially causing venous hypertension.
Full Definition
Dural arteriovenous fistula (DAVF) is an abnormal vascular connection between dural arteries and dural venous sinuses or cortical veins. These acquired lesions are classified according to their venous drainage pattern, with cortical venous drainage (Cognard types III-V) carrying higher risk of hemorrhage and neurological complications. On imaging, findings may include enlarged feeding arteries, early venous filling on angiography, and venous congestion. MRI may show flow voids, venous pouches, and secondary changes such as venous infarction or hemorrhage. High-grade fistulas require prompt treatment due to risk of intracranial hemorrhage and progressive neurological deterioration.
Usage
Usage note: Specify drainage pattern and Cognard classification when applicable.
In Context
- "A high-grade dural arteriovenous fistula was identified with cortical venous reflux." — Cerebral angiography report
- "Endovascular embolization was performed for the transverse sinus dural arteriovenous fistula." — Interventional procedure note