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Lesions of the first costal cartilage in a 43-year-old female with SAPHO syndrome. a Axial fat-only T2W Dixon image shows irregular hyperintensity in the ossified bones in the right first costal cartilage, indicating fat infiltration. b Axial water-only T2W Dixon image shows irregular ossification beneath the perichondrium of the bilateral first costal cartilage and hyperintensity in the surrounding soft tissue, indicating inflammation. Lesions are indicated by red arrows
