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A member asked:

During colonoscopy dr tried but was "unable to enter ti" - possible causes? could whatever prevented it also cause severe constipation?

A doctor has provided 1 answer

That's very common: Terminal ileum is not always intubated by colonoscopy--in one series the rate was 72%, and this has often little to do with pathology. (Ref. Dis Colon Rectum. 1985 Jul;28(7):499-501. Endoscopy of the terminal ileum. Börsch G, Schmidt G)

Answered 10/23/2015

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