I believe it is just a result of soft stool being extruded through a rather tense butt.
The stool isn't firm enough to make the anus open to allow passage, so because the stool is soft, the anal opening will determine 'finished size' of what lands in the toilet.
I have the ability of single-minded determination and accurate project focu....Hey, look, a cat!
Crohn's and UC are pretty darn crappy, but if you can't laugh at yourself, you'll cry......I'd much rather laugh.
2001 Dx'd with UC. No remission. No improvement with Remicade. 5/2008 surgery, removal of 6" of left side colon. Dx changed to Crohn's. Remission for 8-9wks after surgery, symptoms returned after resuming 6MP. Changed maintenance med to Methotrexate (MTX) and had great results with IM injections. Nausea and symptoms returning with oral MTX. Switched back to IM injections and am slowly improving.