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Fig. 4B —35-year-old man with Crohn's disease and perianal fistula. Axial fast spin-echo 2D T2-weighted fat-suppressed iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) image (TR/TE, 5,117/116) (A) and corresponding non-IDEAL fat-saturated fast spin-echo image (10,000/119) (B) show fistula track (arrows) arising from left lateral wall of anus and coursing posteriorly to extend through internal and external sphincters. Note that fat suppression is less uniform in traditional chemically fat-suppressed image (asterisks, B).