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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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Scalloping of edge of sigmoid colon on barium enema is seen in:
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The correct answer is  Ans.C. Ulcerative colitisExplanationFeatures of ulcerative colitis on barium enema are as follows:Acute ulcerative colitisChronic ulcerative colitis*. Fine mucosal granularity (due to edema)*. Scalloping of edges of colon, especially sigmoid colon*. Collar button ulcers*. Pseudopolyps*. Toxic megacolon*. Lead pipe colon due to loss of haustrations*. Shortened and narrowed colon*. Backwash ileitis*. Thickened rectal valve*. Widened presacral space (>1.5 cm at S4 vertebral level)*. Benign stricture*.Colorectal carcinomaSign seen on barium enema in other options given in question is as follows:(Option a) Pseudomembranous colitis -->> ' Accordion sign'.(Option b) Intussusception ->> Tincer sign'.(Option d) Ischemic colitis --> 'Thumb printing sign'.Scalloping of edge of sigmoid colon can also be seen in cases of large pelvic masses or pseudomyxoma peritonei causing extrinsic compression on sigmoid colon.