The patient was a 70s woman who was referred to our hospital with a complaint of bloody stool. Colonoscopy revealed type 2 tumor at a distance of 1 cm from the dentate line, without obstruction. The pathological diagnosis was adenocarcinoma. Enhanced CT revealed a tumor at the rectum below peritoneal reflection as well as swelling of the mesorectal lymph nodes. Multiple liver and lung metastases were also observed. The diagnosis was lower rectal cancer cT4aN2M1b(H2, PUL2), cStage Ⅳ. Chemotherapy was performed for disease control because of unresectable metastases. She received 7 courses of mFOLFOX plus bevacizumab. Further, as the metastatic lesion was inhibited, the primary lesion was excised for the purpose of symptom control. We judged that sphincter preservation was impossible because it was 1 cm away from the dentate line. She underwent robot-assisted abdominoperineal resection with D3 lymphadenectomy and sigmoid colostomy.
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