FIG 1.

Sella expansion and skull base pitting in IIH. Sagittal CT image (A) in a 38-year-old woman with pseudotumor cerebri demonstrates marked expansion of the osseous walls of the sella (short solid arrows), with frank dehiscence posteriorly. Corresponding sagittal MR image (B) shows flattening of the pituitary tissue along the floor of the sella (long solid arrow). Prominent pitting is also noted along the anterior margins of both middle cranial fossae (dashed arrows, C). 3D reconstruction image of an MRV (D) demonstrates smooth tapering of the bilateral transverse sinuses (dashed ovals), compatible with IIH.