FIG 3. Patient 7, a 70-year-old woman status post prior resection of a left supraorbital lesion presents with a palsy of her left CN V1.

A, Contrast-enhanced axial T1-weighted MR image (600/11/2) with fat saturation demonstrates subtly asymmetrical enhancing soft tissue (anterior arrow) in the left superior orbital fissure/cavernous sinus, as well as the anterosuperior aspect of Meckel’s cave (posterior arrow).

B, Six months later, repeat contrast-enhanced axial T1-weighted image (600/11/2) demonstrates interval disease progression along the cisternal segment of the trigeminal nerve to involve the pons and cerebellar peduncle. Enhancing soft tissue completely fills Meckel’s cave on the left (arrow) as compared with the normal right side (arrowhead).