Left sided reverse colocolic intussusception secondary to malignant polypoidal growth: a rare clinical entity

Intussusception is telescoping of a segment of gastrointestinal tract into an adjacent one (mostly distal, sometimes proximal). Though common in children in the first two years of life (90-95%), it is uncommon in adults (5-10%). Adult intussusception is most commonly ileocolic, ileo-ileocolic, ileoileal, colocolic, multiple and retrograde. While benign tumours account for most of the small intestine intussusceptions, malignant tumours account for 50% of colocolic intussusception. Adult colocolic intussusception is very rare on left side of colon, especially at splenic flexure. It is rarest to find a reverse intussusception of left sided colon with descending colon intussuscepting into transverse colon with adenocarcinoma as the lead point. Only 25 cases of retrograde intussusception of colon have been reported. This patient had oncological resection of the colon.