Reason: patient with ulcerative colitis with low back pain with inflammatory description. Normal SI joints xrays outside. Evaluate for any sacroiliitis changes History: patient with ulcerative colitis with low back pain with inflammatory description. Normal SI joints xrays outside. Evaluate for any sacroiliitis changes We see no fluid within or enhancement of the sacroiliac joints. Below the level of the sacroiliac joints, there is a small focus of edema and enhancement within the lateral portion of the S4 segment, that is nonspecific. We otherwise see no bone marrow abnormalities. The visualized portions of the lower lumbar spine are unremarkable.
Small focus of nonspecific edema and enhancement in the lateral portion of the S4 segment, inferior to the right sacroiliac joint, of uncertain significance. The sacroiliac joints themselves appear normal. 