Twenty patients with villous adenoma of the large bowel were reviewed to reevaluate the radiologic findings and to correlate histologic and radiologic feature. Preoperatively, 8 cases were correctly diagnosed by the double contrast barium study (40%). Other radiologic diagnosis included carcinoma in 6 cases(30%), mass in 3 cases(15%) and polyp in 2 cases(10%) respectively. The main radiologic findings o0f villous adenoma were sessile growth(55%) with reticular surface(70%), and involved the rectosgnoid colon in 95% of the cases. The unusual feature of villos adenoma were annular form which mimic annular carcinoma. Malignant transformation occured in 8 cases(40%). The size of villous ademona with malignant transformation occured in 8 cases(40%). The size of villous adenoma with malignant transformation were bigger than benign form. No malignant change were observed in adenoma with perdicle or nodular surface pattern. If the tumor has more villous component on histologic examin tion, the surface pattern became more villous and the gross feature became more sessile and annular on radiologic finding and the tendency of malignant change was increase. We concluded that as villous adenoma has distinctive gross pathologic finding, better understanding of the radiologic finding will improve the diagnostic accuracy. Also the prediction of villous component and malignant potential with double contrast study will contribute to determine the treatment plan.