Fig. 16.

A 37 year old female with acute confusion was diagnosed with AHL, having histopathologic confirmation. Reduced diffusion is noted within the cortex unilaterally on DWI (A) and ADC map (B), with accompanying hyperintensity on FLAIR (C) and mild cortical enhancement on postcontrast T1WI (D). The unilaterality, asymmetry, mild enhancement, and mass effect are not typical of ATL, as well as the lack of PVWM reduced diffusion. Although no hemorrhage was noted on T2WI, diffuse microhemorrhages were confirmed on histopathology.