Colonic Lipoma

Gastrointestinal lipomas are not common, and are most frequently seen in the colon. Most of these are right sided (as in this case) and submucosal (90%) - and these can become polypoid.
Malignancy is exceedingly rare, and usually these are asymptomatic. The leading complication is Radiopaedia.org here.
Reference: Medcyclopaedia.org.
Credit: Dr Frank Gaillard
http://www.radpod.org