| Summary: | We report the case of a 65-year-old male with a metachronous abdominal wall metastasis secondary to colorectal cancer. The patient had presented 5 years ago to another facility with a perforated sigmoid colon cancer (pT4a[SE], N0, M0, pStage II), rectal cancer (T2[MP], N0, M0, pStage I), and Fournier gangrene. He had then undergone sigmoidectomy and rectal resection along with S-1 adjuvant chemotherapy. No relapse was observed thereafter. However, currently, 5 years after initial surgery, the patient noticed a palpable mass in the left lower abdomen and was referred to our hospital for further assessment and treatment. Percutaneous echo-guided needle biopsy of the tumor revealed an adenocarcinoma tissue. Following 6 courses of FOLFOX plus cetuximab chemotherapy, laparoscopic resection for abdominal wall metastasis was successfully performed. The resected tissue was pathologically characterized as adenocarcinoma, which was compatible with the recurrence of the primary colorectal carcinoma resected 5 years ago. The abdominal wall metastasis was attributed to the cancer cell implantation secondary to the perforated sigmoid colon cancer treated 5 years ago.
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