This dural arteriovenous fistula of the superior sagittal sinus drains into subarachnoid veins .
This dural arteriovenous fistula of the superior sagittal sinus is classified as Borden type IIIb .
This dural arteriovenous fistula of the superior sagittal sinus drains into subarachnoid veins and is classified as Borden type IIIb .