Figure 13a. Difference between a polyp and a diverticulum at virtual and conventional colonoscopy. (a) Image from virtual colonoscopy shows a polyp (black arrow) and two small diverticula (white arrows) in the cecum. In general, there is an incomplete border around a polyp, whereas a diverticulum has a complete ring around the orifice. If there is uncertainty at endoluminal imaging, axial images are helpful in differentiating these entities. (b) Image from conventional colonoscopy shows the polyp (black arrow), which measures 7 mm, and the diverticula (white arrows).