A diverticulum is a small bulging sac pushing outward from the colon wall. More than one bulging sac is referred to as diverticula.

What are a diverticulum and diverticula?

A diverticulum is a small bulging sac pushing outward from the colon wall. More than one bulging sac is referred to as diverticula. Diverticula can occur throughout the colon but are most common near the end of the left colon called the sigmoid colon.