Figure 6a. Sessile cecal polyp (adenoma). Three-dimensional CT colonographic (a), endoscopic (b), and axial 2D CT colonographic (c) images show a 2.6-cm sessile cecal polyp (arrow) adjacent to the ICV (arrowhead in c). Note that the lobulated surface of the polyp is better depicted at endoscopy than at CT colonography, which is generally the case. However, superficial lobulations on larger polyps can suggest underlying villous components associated with an increased risk of malignancy. The polyp was resected endoscopically and proved to be a tubulovillous adenoma.