Acute sacroiliitis

Case contributed by Bahman Rasuli
Diagnosis almost certain


Recent onset severe pelvic pain.

Patient Data

Age: 16 years
Gender: Male

Abnormal subchondral bone marrow signal involves both surfaces of the sacroiliac joint more prominently on the left side and displays the low signal on T1 and high signal on T2WI and fat-suppressed images due to the acute inflammatory process (osteitis).

Preserved joint space of ligaments and synovial parts of the right sacroiliac joint.

Normal shape and signal intensity of the muscle attachments. No enthesitis.

Case Discussion

MRI findings are consistent with acute sacroiliitis.

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