[A Case of Intussusception Due to Small Intestinal Cancer Diagnosed by Laparoscopy].

Most cases of primary small intestinal cancer are diagnosed at an advanced stage, and when accompanied by intussusception or obstruction, emergency surgery may be required. Preoperative evaluation of small intestinal cancer is challenging. The patient was a 52-year-old man who was referred to our hospital with abdominal pain and vomiting, and was diagnosed with small intestinal intussusception. Abdominal CT at our hospital revealed bowel wall thickening at the site where the intussusception had resolved, raising suspicion for small intestinal cancer. Based on the patient's clinical history and physical findings, delayed small intestinal perforation was suspected, and emergency surgery was performed. Laparoscopy-assisted surgery was carried out to resect the small intestinal tumor and peritoneal dissemination nodules. Pathological examination revealed moderately differentiated adenocarcinoma. The final diagnosis was pT3, pN1, pM1, and Stage Ⅳ. Laparoscopic surgery for small bowel cancer can be useful both for treatment and intraoperative diagnosis. In this case, the decision to perform non-curative resection based on the Stage Ⅳ diagnosis enabled early discharge and prompt initiation of additional treatments.