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Fig 3. Partially recanalized thrombosis of the left transverse and sigmoid sinuses (patient 6). Shown are a TOF-MRV oblique MIP (A), a CE-MRV oblique MIP (B), a local oblique volume rendered CE-MRV image (C), and an axial reformatted source image from CE-MRV (D). No flow signal intensity was identified on TOF-MRV within the thrombosed left transverse and sigmoid sinuses (A). There was normal flow-related signal intensity in the right transverse and sigmoid sinuses (arrowheads, A). The morphology of the partially recanalized sinuses is better depicted on CE-MRV (B). Small irregular recanalized channels were seen within the left transverse sinus (small arrows, B). The sigmoid sinus opacifies more completely; however, focal and linear irregular filling defects are visualized (arrowheads, B). The left transverse and sigmoid sinuses enhance less prominently than the normal right transverse and sigmoid sinuses (large arrows, B). The small irregular recanalized channels are even better depicted on a detailed volume-rendered representation (arrows, C). Reformatted axial images from the CE-MRV demonstrate internal filling defects within the left transverse sinus, consistent with hypoenhancing thrombus (arrows, D).
