Crohn's disease. Evaluate for abscess. PELVIS:UTERUS, ADNEXA: No significant abnormality noted.BLADDER: No significant abnormality noted.LYMPH NODES: Left internal iliac lymph node measures 0.9 x 0.6 cm. Small bilateral inguinal lymph nodes.BOWEL, MESENTERY: A right lower quadrant ileostomy is again identified. Patient is status post total colectomy. Prominent mesenteric fat is again identified.BONES, SOFT TISSUES: The previously identified left piriformis abscess has resolved. There is increased T2 hyperintensity along the left sacroiliac joint and ilioischial recess, probably sacroiliitis. No drainable collection is identified. There is a focal area of enhancement within the left obturator externus measuring 1.4 x 1.2 cm (series 1201, image 83), decreased from prior. There is underlying left ischial bone marrow changes.OTHER: No significant abnormality noted.
1.Interval resolution of left piriformis abscess. 2.Increased T2 hyperintensity along the sacroiliac joint, probably sacroiliitis.3.Decreased left obturator externus collection.