Figure 9a. Usefulness of multiple window settings in evaluation of filling defects. (a) Endoluminal CT image shows an 11-mm filling defect of indeterminate origin (arrows) in the cecum. (b) Image from conventional colonoscopy shows the lesion (arrows). (c) Supine axial CT image obtained with a window width of 1,500 HU and window level of -200 HU shows that the lesion (arrow) is indeterminate. (d) Supine axial CT image obtained with a window width of 400 HU and window level of 10 HU shows that the lesion (arrow) is a lipoma. The presence of adipose tissue in a filling defect is confirmation of a lipoma.