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Grade II diffuse astrocytoma in a 66-year-old man. A, Transverse T2-weighted image shows a hyperintense mass (arrow) in the left medial temporal lobe. B, Coronal contrast-enhanced T1-weighted image shows slight tumor hypointensity without enhancement (arrow). C, Transverse DWI at b = 1000 s/mm2 shows tumor isointensity. D, Transverse DWI at b = 3000 s/mm2 shows marked tumor hypointensity. Transverse ADC maps at b = 1000 s/mm2 (E) and b = 3000 s/mm2 (F) show tumor hyperintensity.
