[A case of transverse-sigmoid sinus dural arteriovenous fistula that became symptomatic after removal of coexisting sphenoid ridge meningioma].

: Here, we describe a case with a transverse-sigmoid sinus(TSS)dural arteriovenous fistula(DAVF)with sinus occlusion at its proximal and distal ends;the TSS DAVF turned symptomatic after removal of a coexisting symptomatic sphenoid ridge meningioma. The patient was a 70-year-old man presenting with decreased daily activities and mentation due to dysphasia. Magnetic resonance imaging revealed a large, left sphenoid ridge meningioma. Angiography revealed a tumor stain and a coexisting left TSS DAVF with sinus occlusion at its proximal and distal ends. Cortical venous reflux(CVR)into the temporal veins was observed. After successful tumor removal, the superficial middle cerebral vein was arterialized intraoperatively. However, the patient showed worsened consciousness and dysphasia after the operation. Repeated angiography revealed CVR into the superficial middle cerebral vein through a sphenopetrosal sinus. Transvenous embolization was performed via the contralateral inferior petrosal and intercavernous sinus, which allowed access to the ipsilateral superior petrosal sinus(SPS);the procedure successfully eliminated CVR, while preserving the SPS. The patient demonstrated full recovery. This case exemplifies a coexisting TSS DAVF after tumor resection, and superficial middle cerebral vein decompression due to the sphenopetrosal sinus, an alternate drainage pathway for the superficial middle cerebral vein.