CT-Demonstrated Transcalvarial Channels Diagnostic of Dural Arteriovenous Fistula

sociated with the presence of a dural arteriovenous fistula have been described in the literature. We describe these channels in relation to a case of dural arteriovenous fistula seen on CT. The presence of this subtle sign should be sought, and the area reviewed in all CT evaluations of patients with pulsatile tinnitus. Dural arteriovenous fistulas are uncommon intra-cranial vascular lesions whose characteristic feature is the shunt surgery of flow from meningeal arteries directly into the dural sinuses or leptomeningeal veins. MR imaging and digital subtraction angiogra-phy are used to confirm the diagnosis of dural arte-riovenous fistula, with therapeutic potential existing in the case of the latter. The role of CT has tradition-ally been to elucidate the presence of any complica