Sigmoidorectal intussusception caused by colon carcinoma.

Background. Intussusception, the invagination of a bowel segment into an adjacent segment, occurs in 5% of adult patients with an obstruction of the bowel. It is often seen as a result of obstructive defecation syndrome or malignancy. However, a sigmoidal malignancy as lead point is rare. Symptoms in adults are less specific than in children, which makes preoperative diagnosis challenging. Reported case. An 85-year-old female presented with bright red anal blood loss. A large palpable mass was found during rectal examination. A computed tomography was performed during workup, which showed a "target-sign" on the location of the laesion. An intussusception of the sigmoid into the rectum was seen over the length of 15 centimetres. This particular type of intussusception is extremely rare. Conclusion. When a neoplasm is suspected to be the lead point, an oncological resection is recommended. We performed a total mesorectal excision, after which the patient had an uneventful recovery.