Your docs are probably trying to get all the answers to decide the best form of treatment, and also decide if surgery is necessary just how much of the colon
is affected. The vasculature of the descending
portion of the colon varies greatly from person to person. So if a portion needs to be removed, they're going to want to save the maximum amount of colon possible - leaving clear margins for reattachment. It can take a bit of time to figure that out.