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FIGURE 1. Coregistered and normalized pre- (top) and post- (bottom) chemoradiation 18F-FDG PET scans show complete resolution of metabolic activity at site of this T3 N0 M0 tumor. Reference maximum-intensity-projection images demonstrate normalization of scan appearances. Corresponding transaxial (middle left), sagittal (middle right), and coronal (right) planes through the level of the tumor demonstrate no residual metabolic abnormality and were graded as CMR. Note appearance of mildly increased uptake distal to initial tumor site but within the radiation volume. This was reported as probable radiation proctitis and was consistent with sigmoidoscopy findings. This patient is FFD at 4 y. ANT = anterior; POS = posterior.
