The answer to my question could well be how long is a piece of string, as the saying goes.
How long can internal scar tissue last? I had surgery almost two years ago to remove a large sarcoma which necessitated removing my left kidney, spleen, left half of the colon and about half the pancreas. I found the description of scar tissue as being like cobwebs and this https://www.innova-pain.com/2015/06/10/what-is-scar-tissue/ useful.
