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A 2-year-old female with a left parietal primitive neuroectodermal (PNET), WHO grade IV. (a) Axial T1 postcontrast. A faintly enhancing left parietal lobe mass is present (arrows). (b) DWI sequence. The mass is hyperintense on diffusion-weighted imaging. (c) ADC map. Signal hypointensity of the lesion on the ADC map (arrow) is present, consistent with restricted diffusion related to dense cell packing.
