I've heard the same thing as Eva Lou. I've talked to 2 surgeons this week and they both said that the pathology report of the removed colon will tell us for sure whether it's Crohn's or UC. However, it is a very small percentage of people who were thought to have UC but actually have Crohn's.
Female, Age 19, Dx w/ UC August 2007
9 Asacol, Rowasa, 1000 mg Canasa, Proctofoam, Rifaximin 2/day
Digestive Advantage (Crohn's & Colitis), 1 Florastor, 50 mg 6MP,1 Primadophilus reuteri, Remicade (3rd infusion 07/08), 2.4 g Lialda, 1 Forvia, 6 Colazal/day
*exploring the option of surgery