Dural Arteriovenous Fistula at the Craniocervical Junction with o

wed spas-iffusely in-of the an-vical spine d swelling0.5 T because of paresthesias in the lower limbs, urinary retention, and progressive gait disturbance, beginning 4 years earlier. The neurologic examination showed moder-ate paraparesis, bilateral foot drop, clonus of the ankles, and global hypesthesia below T-9. The upper and midtho-the right hand. The neurologic examination sho tic tetraparesis, weakness of the right leg, d creased deep tendon reflexes, bilateral clonus kles, and Lhermitte sign. MR imaging of the cer at 0.5 T showed spondylotic changes at C-5 an Received July 11, 1995; accepted after revision October 24.Perimedullary Venous Drainag