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Fig. 3B —47-year-old man with clinically proven rheumatoid arthritis. Radiograph obtained 10 days before MRI shows soft-tissue swelling (arrows) and narrowing of joint space of proximal interphalangeal joint of fourth ray as typical finding of arthritis. Note that radiographs are provided for case illustration. Systematic comparison between MRI and radiographs was not performed because of lack of radiographs in temporal proximity to MRI examination.