Figure 1

CT-scan showing the obstructing sigmoid carcinoma infiltrating the left lateral abdominal wall (a, thin red arrow), with a 4.5 cm metachronous left inguinal lymph node metastasis at PET-scan (b) and CT-scan (c, thick red arrow), which was histologically consistent with inguinal nodal metastasis from colonic carcinoma (HE, x 40) and positive expression of cytokeratin 20 at immunohistochemistry (anti-CK20 monoclonal antibody staining, x 100), (d).