Figure 25 (A and B): Compressive optic neuropathy: Venolymphatic malformation. Axial T2 fat-saturated (A) images of a 12-year-old girl with proptosis and decreased right vision showing an encapsulated, diffuse multicompartmental T2-heterogeneous lesion with fluid-fluid levels (arrow) suggestive of venolymphatic malformation. On CT scan (B) the lesion shows minimal heterogeneous post-contrast enhancement (arrowhead)