Direct vision best: Colonoscopy is best for allowing direct vision of the bowel and bx which an MRI can't accomplish. There is virtual colonoscopy where a scanner looks at the bowel as if there were a scope within and is almost comparable to the direct form. New tests being developed look at gene alterations in stool or more recently shedding of tumor antigen into stool, the measurement done in GP office.
Answered 12/8/2014
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