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Myositis ossificans. On coronal fat-saturated T2-weighted MRI sequence (a), an intermediate-to-high signal mass is noted close to the medial aspect of the proximal humerus. This mass is separated from the underlying bone. A central chondroid lesion of the humerus is also seen. On CT (b), “zonal phenomenon” with peripheral mineralization and central lucency is shown. Myositis ossificans was pathologically proven. Arrow points at myositis ossificans in both images
