Purpose : To evaluate the CT and US features of the colonic villous tumors. Materials and Methods : Weretrospectively reviewed the CT findings of 11 cases with histologically proved colonic villous tumor. CTparameters evaluated were morphological appearances and enhancing pattern (size, shape, margin, presence orabsence of fronds, bowel wall thickening). CT features of six cases with malignant change were compared with fivetumors without malignant change. US features available in 10 patients were also analyzed. Results : On CT, thetumors showed irregular margin(n=9), presence of fronds(n=6), lobulated shape(n=11), with pericolonicinvasion(n=1). Six cases with malignant change were larger(mean, 6.8cm in diameter) than those without malignantchange(mean, 3.3 cm). US features in 10 cases were intraluminal mass(n=5), colonic wall thickening(n=5), withvariable echogenicity. Conclusions : Colonic villous tumor appeared as a nonspecific mass on CT and US with adifficulty in distinguishing from colon carcinoma.