Figure 1:

Diminutive polyp at initial CT colonography screening that grew to small size at follow-up screening 6 years later in an asymptomatic woman (61 years old at initial screening; 67 years old at repeat screening). Top: two-dimensional (2D) (left) and three-dimensional (3D) (middle) images from the initial CT colonography screening in 2005 show a diminutive lesion (arrowhead for 2D, arrow for 3D) measuring less than 5 mm in the proximal transverse colon. The specific colonic location is indicated on the colon map (right) by the red dot. We do not report isolated diminutive lesions at CT colonography screening. Bottom: 2D (left) and 3D (middle) images from repeat CT colonography screening in 2011 show that the sessile polyp has grown in the intervening 6 years, now measuring 7 mm (arrowhead for 2D, arrow for 3D). The polyp was confirmed (arrow) and removed at same-day colonoscopy (right) and proved to be a tubular adenoma at pathologic evaluation.