Sherry...it could be a combo of nerve-related/sphincter and stool consistency related. Even though yours are of the formed calibre variety (lol), there could easily be some stool that is hurried more quickly through or depending on what you ate, some that the consistency is much more soft and easily not felt by the rectum and is expelled during pushing while urinating.
I've had that happen to me on occasion, more when I'm flaring.
When the stool is more soft, for me..I've been eating more fruit and using digestive enzymes which could be part of why the stool might be softer). I think taking a fibre supplement could be helpful as well (which I'm going to consider what's one more thing.lol)...just enough to bulk things up a bit more.
Scary for all the things you're going through at this time...it's good the doc is getting you tested for a host of things.
The MRI is very noisy, and you'll be in a small area for a lwhile. Hope you're not claustrophobic...if you are, a xanax can help as well as keeping your eyes closed.
I've had both head and abdomen done. The head one was loudest. The abdomen one...my head was closer to the end of the "tunnel" and it wasn't bad at all. As well, I had to do breathing successions on command, so didn't have time to feel anxious.
You'll be fine with it.
Keep us posted as to how you're doing.
*Heather*Status: mini flare Dec 28... tapered to every 4th night
~diagnosed January 1989 UC (proctosigmoiditis)
~5ASA: Asacol (6 daily) + Salofalk enemas (increase for flares tapered to maintenance)
~Bentylol (dicyclomine) 20mg as needed
~Probiotic 3(Natural Factors Protec) bedtime + 1 (Primadophilus Reuteri) occasionally
~multi-digestive enzymes as needed ....zymactive 3 - 5x daily
~Ranitidine,Pariet (reflux) Effexor XR 75mg; Pulmicort/Airomir (asthma)
~URSO for PSC (or PBC) 500mg X 2 daily (LFTs back to NORMAL!!)
My doc's logic.. "TREAT (FROM)BOTH ENDS" worth it !!!