I believe CT Enterography would be the next best, but our GI informed us that the downside is that it requires considerably more radiation exposure.
Is your fistula involving the small bowel? Just curious to know what treatment you've had and how long you've had it.
My daughter was diagnosed Feb. 19/07, (13 yrs. old at time of diagnosis), with Crohn's of the Terminal Illium. Has used Prednisone and Pentasa. Started Imuran (02/09), had an abdominal abscess (12/08). 2cm of Stricture.