The Role of Radiology in Obstructing or Bleeding Anal and Rectal Cancers
Anorectal malignancies may present acutely when complicated by bowel obstruction or bleeding. Abdominal radiographs can screen for bowel obstruction or perforation. CT is a dependable tool to diagnose obstruction and its complications and can stage the disease. MRI is a more sensitive method to assess local extent of tumor. Contrast enema is an alternative method to prove obstruction. The presence and source of GI bleeding can be revealed by CT angiography, scintigraphy, or catheter angiography; the last is most useful when treatment via catheter is feasible.
KeywordsAnorectal cancer Bowel obstruction GI bleeding CT Contrast enema MRI Angiography Scintigraphy
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