Fig. 2

A–D A 40-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); the fused image revealed operative bed small low-grade FDG avid nodular thickening involving the right aspect of the pre-sacral fascia which was not obvious in the conventional CT images (blue arrow). A delayed scan was obtained (C, D), and revealed an increase in the FDG avidity of the lesion keeping with its neoplastic nature and confirming residual tumoral tissue at the operative bed (red arrow)