Fig 8.

Coronal gadolinium-enhanced T1-weighted image (TR/TE/NEX, 500/15/2) at the level of the foramen rotundum demonstrates an enhancing V2 branch on the right when compared with the left (arrows). This is considered to represent a normal anatomic variation, because the subject did not have any symptoms related to V2 dysfunction or history of malignancy. The perineural venous plexus and V2 cannot be separated from each other. This appearance might be caused by a more prominent venous plexus. On the left, the perineural venous plexus (white arrowhead) is incomplete and absent in the inferior lateral aspect. The black arrowhead indicates the bony boundary of the foramen rotundum.