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Fig. 3A. —50-year-old woman with septic arthritis of left sacroiliac joint and negative findings for osteomyelitis on biopsy. On axial T2-weighted fat-suppressed image, reactive marrow edema in sacrum (asterisk) is greater than edema in ilium, consistent with reactive changes. Also noted is effusion posteriorly, anteriorly, and medially (curved arrows). What is striking is synovial outpouching (thick straight arrow), and its dissection away from joint (thin straight arrows) to form microabscess.