FIG 6. Coronal gadolinium-enhanced T1-weighted image (TR/TE/NEX, 400/15/2) suggests a significantly enhancing right trigeminal ganglion (right arrow). The perineural venous plexus (right arrowhead) and the trigeminal ganglion cannot be identified as separate structures. This appearance is thought to be due to obscuration of the ganglion by a more extensive perineural venous plexus than that typically seen. The subject did not have any symptoms related to trigeminal nerve or a history of malignancy. Therefore, this is considered a normal variation in imaging appearance. The contralateral side demonstrates the typical appearance of the trigeminal ganglion (left arrow) and of adjacent venous plexus (left arrowhead).