Intussusception in which colon cancer acts as a lead point has been previously reported in a number of cases, but prolapse of the tumor through the anus has rarely been reported, and most of those few previous reports have involved elderly individuals. Case presentation: The patient in this case was a 26-year-old Japanese woman who presented to our emergency department with severe pain after her intestinal tract prolapsed through the anus during defecation. The intussusception was released laparoscopically, and we were able to perform complete mesocolic excision in a manner similar to conventional laparoscopic sigmoidectomy for sigmoid colon cancer prolapse through the anus in a young woman. Since liver metastases were identified on computed tomography, the patient underwent partial hepatectomy twice. The patient has been followed-up for eight years since the initial surgery and remains alive without recurrence.

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