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Fig 2. Dural arteriovenous fistula at left transverse-sigmoid sinus in a 52-year-old woman (case 7).
A, T2-weighted image shows no prominent flow voids on the cortical sulci.
B, Left external carotid angiogram depicts reflux in the vein of Labbe and retrograde cortical venous drainage with occlusion of left transverse sigmoid sinus.
C, Color overlay of relative cerebral blood volume (rCBV) map shows marked increase of CBV in the left hemisphere (mean rCBV ratio, 1.32).
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