Case of the Week

A and B, Coronal and axial T2-weighted images show intermediate signal lesion in the optico-chiasmatic region (white arrow) with edema along the optic tracts (blue arrow). C and D, Coronal and axial postcontrast images show heterogeneous enhancement of the lesion (white arrow) with right retinal detachment (star), extensive pachymeningeal enhancement along the cerebral convexities (red arrows), and tentorial leaflets. E and F, T1 postcontrast sagittal images of the spine show diffuse enhancement over the surface of cord and along the cauda equina nerve roots (white arrows).