[Two Cases of Port-Site Recurrence after Laparoscopic Surgery for Colorectal Cancer].

Port-site recurrence is a rare manner of recurrence specific to laparoscopic surgery. Herein, we report 2 cases of port-site recurrence after laparoscopic and robot-assisted surgeries for colorectal cancer at our institution. Case 1: A 57-year-old woman underwent laparoscopic ileocecal resection for cancer of the ascending colon. Thirty-seven months after the surgery, the patient presented to our hospital with a mass in the right lower abdomen. It was observed in the abdominal wall, corresponding to a port-insertion scar on the right lower abdomen. As no metastases to other organs were detected, en bloc excision of the abdominal wall tumor was performed. Pathological examination revealed metastatic adenocarcinoma from colon cancer; therefore, we diagnosed port-site recurrence. Case 2: A 74-year-old woman underwent robot-assisted lower anterior resection for rectal cancer. Eight months after surgery, liver metastasis was detected, and the patient underwent laparoscopic hepatectomy 14 months after the initial surgery, following chemotherapy. Twenty months later, contrast- enhanced CT revealed a mass in the abdominal wall corresponding to a port-insertion scar in the right abdomen. As no metastases to other organs were detected, en bloc excision of the abdominal wall tumor was performed. Pathological examination revealed metastatic adenocarcinoma from the rectal cancer; therefore, we diagnosed port-site recurrence.