Suspected only: Colonoscopy can show a mass that is very suspicious for cancer, but can't be diagnosed until the cells are looked at under the microscope after a biopsy or removal.
Answered 11/2/2015
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Colon evaluation: Most common evaluation now is colonoscopy, at which time a small biopsy may be taken. Other options include barium enema and computed tomography (ct scan).
Answered 5/28/2013
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