66-year-old female patient with Crohn's disease and fistula in 6/2015. Evaluate for perianal Crohn's disease. PELVIS:UTERUS, ADNEXA: No significant abnormality noted.BLADDER: No significant abnormality noted.LYMPH NODES: Scattered small mesenteric lymph nodes.BOWEL, MESENTERY: There is an 8 cm segment of rectum and distal sigmoid colon with mild wall thickening and increased edema signal that extends to the anal verge with enhancement. The ischiorectal fat is indurated and there is an enhancing left anterior transsphincteric perianal fistula that extends from the 2:00 position to the left perineum (series 9 image 76). There is also a blind ending tract extending from the anterior anus, 12:00 position (series 9 image 74).BONES, SOFT TISSUES: No significant abnormality noted.OTHER: No significant abnormality noted.
1.Left anterior transsphincteric perianal fistula extending to the left perineum.2.Blind ending tract from the anterior anus.3.Active inflammatory changes of the rectosigmoid colon compatible with history of Crohn's disease.