FIG 2. 45-year-old man referred for follow-up of a presumed schwannoma posterior to the left occipital condyle, shown to be the left posterior condylar vein.

A and B, Contrast-enhanced fat-suppressed T1-weighted (640/14/3) coronal images (A posterior to B) show the suboccipital cavernous sinus (asterisk), marginal sinus (arrowhead), posterior condylar vein (short arrows), and vertebral venous plexus (long arrows). The right posterior condylar vein is diminutive.