Dural arteriovenous fistulae (DAVF) are rare, abnormal connections between arteries and veins in a protective membrane on the outer layer of the brain and spine, called the dura. These abnormal blood vessels divert blood from the normal paths. In the classification of vascular anomalies currently employed, a division is made between tumors and malformations. These tumors are usually solitary but not infrequently they may be multiple and involve the liver, gastrointestinal (GI) tract, and central nervous system (CNS). They are characterized by three phases of growth, as follows Proliferation Involution Involuted phase One approach used for treatment is embolization. AVMs occur with equal frequency among males and females.