Fig 1. Normal contour of the transverse sinus. A, T1-weighted image through the approximated middle third of the dominant transverse sinus in a normal control. B, Magnified and cropped image of boxed area in A. C, Same image as B, with schematic representations of the inferior border of the transverse sinus drawn on the image. Both solid and dashed lines represent the normal variability in the contour of this lower border as demonstrated in individual normal controls D through K. The dotted line in C depicts the distended, convex, lower border of the middle third of the dominant transverse sinus (the VDS) as seen in intracranial hypotension (Fig 3).