History of Crohn's disease presenting with rectal pain and bleeding. Evaluate for fistula or abscess. PELVIS:UTERUS, ADNEXA: No significant abnormality noted.BLADDER: No significant abnormality noted.LYMPH NODES: No significant abnormality noted.BOWEL, MESENTERY: Note is made of mild bowel wall thickening, enhancement and restricted diffusion of the distal small bowel in the right lower quadrant.BONES, SOFT TISSUES: There is a very thin T2-hyperintense linear focus adjacent to the very distal left lateral anal canal which does not appear to extend through the external sphincter complex and is not associated with a discrete fluid collection. It is at approximately the 4:00 position. It extends 1.4 cm in AP dimension and 1.0 cm in craniocaudal dimension. There is mild associated postcontrast enhancement.OTHER: No significant abnormality noted.
1. Suspected 1.4 cm intersphincteric left (approximately 4:00) lateral peri-anal fistula. No discrete fluid collection. 2. Acute inflammation of the partially imaged distal small bowel in the right lower quadrant.