COVID-19–Associated Miller Fisher Syndrome: MRI Findings

Axial and coronal T2-weighted fat-suppressed images through the orbits (A and B) demonstrate an enlarged CN III (arrow) with increased signal involving the nerve from the cavernous sinus through the orbit. Coronal T1-weighted fat-suppressed postcontrast image (C) also shows an enlarged CN III within the proximal orbit (arrow) and demonstrates marked enhancement of the nerve. The abnormal nerve is also visible on a whole-brain T2 FLAIR fat-suppressed postcontrast image (arrow, D).