Fig. 1.

Multimodality MRI exam of a subject with a recurrent LGG that had undergone MT. Neurosurgical tissue targets were planned based on regions of suspected tumor using additional functional MR techniques. The imaging revealed a heterogeneously enhancing region of recurrent tumor situated in the left posterior temporal and parietal white matter. An additional, masslike non–contrast enhancing region of residual tumor was also seen in the left insular white matter. This lesion was consistent with residual low-grade neoplasm with marked differences in ADC, PH, and CNI (abnormal regions highlighted in white).