Radiologic Signs in Tumoral Pathology: Polyps and Polyposis Syndromes
Tumoral contour images by the tangent effect (polycyclic or circle images); by accumulation of barium at the base of a lesion (Welin’s “bowler hat sign”) or in tumoral irregularities; and by appearance of the tumor in a barium pool (filling defect)
Tumoral surface images by the addition effect: overlapping of barium coatings of the tumor and colonic walls (“hat sign”, addition image)
Colonic contour changes caused by the tumor (stenosis, indentation) If filling defects are to be included with these signs, they are less important. With the single contrast technique, the larger the lesion, the more clearly it appears. In double contrast, size does not play as important a role. It is by analysis of all the linear images and filling defects, to determine whether or not they correspond to normal anatomic structures by their form and position, that leads to the detection of abnormal images. One of the major principles in interpreting double contrast is the careful analysis of images and their reasoned interpretation. Since not all images have a corresponding logical explanation (anatomic or artifact), they should be considered pathologic until proven otherwise. While advanced tumors may be more difficult to detect for the nonexperienced observer, they do have different but obvious radiologic signs when the quality of the examination is good and its interpretation thorough.
KeywordsFilling Defect Tumoral Pathology Radiologic Sign Polyposis Syndrome Double Contrast
Unable to display preview. Download preview PDF.
- 2.Bussey HJR (1975) Familial polyposis. John Hopkins - LondonGoogle Scholar
- 3.Collins JO, Falk M, Guibone R (1966) Benign lymphoid polyposis of the eolon: a case report. Pediatric 38: 897–899Google Scholar
- 4.Ekelund G, Lindstrom C, Rosengren JE (1974) Appearance and growth of early carcinomas of the colon and rectum. Acta Radiol 15: 670–679Google Scholar
- 5.Gilbersten VA (1974) Proctosigmoidoseopy and polypectomy in reducing the incidence of rectal cancer. Cancer (Suppl) 34: 936–939Google Scholar
- 12.Riehe MC, Weissman A, Menault JY, Elbim A, Grellet J (1977) Pneumatose kystique à localization sigmoldienne: apports respectifs de la mucographie colique (lavement en double contraste) et de l’endoscopie. A propos de un cas. J Radiol Electrol 55: 833–837Google Scholar
- 13.Soullard J (1975) Proctologie, Masson, ParisGoogle Scholar
- 18.Welin S, Youker J, Spratt JS (1963) The rates and patterns of growth of 375 tumors of the large intestine and rectum observed serially by double contrast enema study. Am J Roentgenol 90: 673Google Scholar
- 20.Youkers JE, Welin S (1965) Differentiation of true polypoid tumors of the colon from extraneous material. A new roentgen sign. Radiology 84: 610–615Google Scholar
- 21.Youkers JE, Welin S, Main B (1968) Computer analysis in the differentiation of benign and malignant lesions of the colon. Radiology 90: 794–797Google Scholar