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53-year-old man with synovial osteochondromatosis of the knee; lateral radiograph (a) shows intraarticular calcification with a ring-and-arc shape appearance. Sagittal proton-density SPAIR image (b) displays hyperintense intraarticular osteochondral bodies. On GRE image (c), some of these bodies contain hypointense areas that indicate calcification (from the courtesy of Dr. A. Turan)
