Figure 3 : CT colonoscopy (a) Axial prone and (b) supine MDCT colonoscopy showing mass (white arrow) protruding from colon wall into lumen (c) 3D volume-rendered MDCT colonoscopy showing the submucousal mass protruding into lumen (white arrows) (d) Mean CT attenuation/density of the lesion is -122HU consistent with fat-containing lesion such as lipoma