2 Answers

Me too, and I,m still a bit in the dark, this might help.

Click>>http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2731179/

what that means is that in the descending part of your colon ( the lower vertical part ), they think you might have a melanosis . So they're trying to r / o   that. >. >>>   i.e.  rule out  by doing the colonoscopy. The r/o part is not a diagnosis. It's a rationale  to the health insurance company to get them to compensate you or the hospital or  to pay for it.  A melanosis in  your colon is a stenosis......a..narrowing hole making it hard for the colon to pass fecal matter through it. If that is the case, I suppose they can open it up during the colonoscopy by cleaning out the grundge or dialating the narrowed passage, or by putting in a stent.