Figure 1

Pathological findings of patient in 2010. (a) On 13 March 2010, a lesion was removed from the left groin and pathology indicated lymph node metastasis. (b) On 6 August 2010, a perianal lesion from the left anterior anal wall was removed and pathology indicated adenocarcinoma (CK20⁺). (c) On 11 November 2010, perianal tumors were resected (CK⁺, CEA⁺⁻). CEA, carcinoembryonic antigen; CK, cytokeratin.