Villous adenoma of the large bowel; benign and malignant.

The radiological appearances on double contrast barium enema examination of 14 cases of villous adenoma are described and illustrated. Problems of diagnosis and detection of malignancy are discussed. It is concluded that in the majority of cases a confident radiological assessment of benignancy or malignancy cannot be made. The importance of villous adenoma as a pre-cancerous condition and the high incidence of associated large bowel carcinoma are emphasized.