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Contrast-enhanced (left) T1-weighted images, (middle) magnetization transfer ratio (MTR) parametric maps, and (right) H&E staining of: (top) pure tumor; (middle) pure radiation necrosis; (bottom) mixed model, with tumor growing within a region of radiation necrosis. Red contours outline regions-of-interest of radiation necrosis; yellow contours outline regions-of-interest of tumor. In the H&E, black arrows identify tumor and black arrow heads identify RN.
