The study was concerned with evaluation of the clinical and roentgenologic data on 57 cases of malignant polyps of the colon. Malignant polyps reaching 10 mm in length were found. Malignancies were identified using endoscopy and biopsy in 58.6% and X-ray examination--45.8%. Among the most effective methods of X-ray examination of the large bowel for cancer should be: high-voltage roentgenography employing incomplete barium enema, primary double contrast examination, direct blow-up and parietography. X-ray signs of malignant transformation of polyps are: persistent retention of barium, wavy and indistinct contours, irregular pattern, rapid growth of neoplasm, retraction of tumor base and disparity between polyp size and its pedicle length.
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