A 28 year-old man presented with severe and constant headaches. On examination, he had papilledema.

MRV: (Left) lateral view; (Right) AP view. Note the absence of the posterior portion of the sagittal sinus; the straight sinus, both transverse sinuses and the right internal jugular vein. Only the left sigmoid sinus and internal jugular vein are well seen. Compare this scan to a normal lateral MRV and a normal AP MRV.