ok- i'm unfortunately the kidney stone pro...i've had 9 i think including a small one friday. i stopped at the bank to drop off a check and felt "the pain" and kne exactly what it was...got home and peed and there it was- a small one this time...to answer your questions- if it was one cm i don't think you'd pass it- i think you mean mm...i've has them up to 4 mm's and that's about
the limit...that's HUGE- looks like a rock when it passes- jagged and a bit shiny like silica...awfu;\l- looks like some torture device from long ago.
while kidney stones can be a part of crohn's i have not heard anything about them from remicade- which i am also on. good luck and i really hope you dont get anymore!