Fig. 1From: FDG-PETCT versus contrast-enhanced computed tomography in diagnosis of post-therapeutic colorectal cancer recurrence and metastasesA 52-year-old male patient who underwent surgical resection for pathologically proven colonic adenocarcinoma followed by chemotherapy and radiotherapy and follow-up 6 months later revealed a normal tumor marker level. a Axial post-contrast CT image showing operative bed fluid collection (seroma) with no enhancing component (arrow), b axial fused PET–CT image showing avid metabolic activity at the operative bedBack to article page