<prompt> Answer this question truthfullyWhat is the significance of using X-rays in the diagnosis of familial adenomatous polyposis?  <response>: <reason> Double-contrast Barium enema may be helpful in the diagnosis of familial adenomatous polyposis. Findings on an x-ray suggestive of familial adenomatous polyposis include: Multiple pedunculated outgrowth Basal indentation Lobulation Irregular surface contour 