Figure 5c. Villous adenoma. (a) Endoluminal 3D view from CT colonography shows a 5-cm irregular cecal mass. This papillary appearance is highly suggestive of a villous tumor. (b) Axial 2D image (without electronic cleansing of opacified fluid) shows the same irregular cecal mass (arrowheads). (c) Digital photograph from optical colonoscopy shows the papillary, frondlike nature of the mass to greater advantage. The lesion was not malignant despite its large size.