Chronic nonbacterial osteomyelitis in a 7-year-old girl. Coronal T2-W short tau inversion recovery MR image (repetition time/echo time = 5,000/58 ms) shows involvement of the right sacroiliac joint (high signal in the joint space with surrounding bone marrow edema), the right ischial bone (white arrow) and the left femoral metaphysis/apophysis (black arrow). Note the subtle high signal of the right femoral metaphysis, within normal variation