Does this confirm the diagnosis of a spinal arteriovenous fistula? Anything unusual?
Yes, but in this case there are two fistulas, one from the 3rd intercostal and a second form the 6th.
What proportion of spinal dural AV fistulas have more than one fistulous location?
The majority are single (85%) and consist of a single transdural arterial feeder, however in the remainder there may be many arterial feeders originating from either a single or multiple levels that may be either unilateral or bilateral
There are two areas of arteriovenous shunting filling from nerve root sheath to perimedullary veins.
The highest flow is from the right third intercostal. The drainage from this level was into tortuous perimedullary veins around the cervical and upper thoracic cord.
A second separate focus of spinal dural arteriovenous fistula filled from a right sixth intercostal branch, with drainage being preferentially inferiorly into distended perimedullary veins.