CT features are suggestive of an obstructing rectosigmoid tumor with most likely focal perforation.

Large bowel obstructions are less common than small bowel obstruction. It is considered an emergency condition that requires early diagnosis and intervention. The dilatation of the colon increases the risk of perforation which usually occurs at the site of obstruction or more proximal due to ischemic changes. The most common etiology in adulthood remains colon cancer, typically of sigmoid location.

Additional contributor: Djamel Hamidi, MD EPH Ouargla, Algeria.