Brain and spinal MRI show features of spontaneous intracranial hypotension

(A) Sagittal T1-weighted image of the brain shows signs of "brain sag" with narrowing of both the mammillopontine space (arrowhead) and ventral prepontine cistern (dashed arrow).
(B, D) Post-contrast T1-weighted images of the spine in the sagittal (B) and axial (D) planes show enhancement of engorged epidural venous plexuses (stars) and dural enhancement (thick arrows).
(C) Axial T2-weighted image of the spine shows scalloped thecal sac (arrows) and distended epidural veins (stars).