Figure 2c. Differentiation of bulbous folds from polyps in 63-year-old man. (a) Transverse CT colonographic image shows a 7-mm pedunculated mass (arrow) suspected of being a polyp in the descending colon. (b) Coronal CT colonographic image shows that the lesion seen in a actually represents an interhaustral fold (arrow) with a linear morphologic structure. (c) Three-dimensional endoluminal CT image findings confirm the linear morphologic structure (arrow) of the fold.