Fig. 3

A–F A 25-year-old male patient, with a known case of cancer colon, underwent surgical resection referred for metastatic workup before therapy. In the early scan (A, B); there is an FDG avidity at the left hypochondrial region between the small bowel loops (white arrow in the conventional CT images and blue arrow in fused images). (Collapsed small bowel or deposit) Delayed images were obtained (C, D); revealing persistent FDG avidity is still noted at the same site with an increase in the metabolic activity denoting its neoplastic nature (peritoneal deposit) (white arrow in the conventional CT images and blue arrow in fused images). The patient received CTH and a follow-up PET CT scan was done 3 months later (E, F); revealing a dramatic response with marked morphological and metabolic regression of the peritoneal deposit denoting a favorable response to therapy (yellow arrow in the conventional CT images and green arrow in fused images)