# A Vanishing Polyp: A Large Ileal Lipoma Causing Ileocolic Intussusception

## TL;DR

A 55-year-old man had a large lipoma in his ileum that caused intussusception, a rare condition where part of the intestine folds into another part.

## Contribution

This case uniquely describes an ileal lipoma causing intussusception observed and reduced during colonoscopy.

## Key findings

- A large ileal lipoma was identified as the cause of ileocolic intussusception in an adult.
- The intussusception was observed and reduced during colonoscopy, a unique clinical observation.
- Histology confirmed the lesion as a submucosal lipoma, a rare cause of intussusception in adults.

## Abstract

Intussusception is defined as invagination of a proximal segment of gastrointestinal tract into distal segment and is an uncommon pathology. It is more common in children. In the adult population, it is often due to a polyp or tumor. We report an interesting case of a vanishing colonic polyp in a 55-year-old man who presented with a three-month history of intermittent right abdominal pain, altered bowel habit, and weight loss. Colonoscopy demonstrated a large, elongated polyp in the ascending colon, which vanished during attempts to intubate proximally. A computed tomography scan showed a lipomatous polyp in the distal ileum confirmed on a repeat colonoscopy. The patient proceeded with surgical resection, and histology confirmed the polyp to be an ileal submucosal lipoma. There is literature on ileocolic intussusceptions secondary to ileal submucosal lipoma; however, our case is interesting and unique in that the intussusception was seen and reduced during the colonoscopy.