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Fig. 3A —29-year-old woman with early rheumatoid arthritis and
tenosynovitis. R = radius, U = ulna, t = tendon. Transverse fat-suppressed
gadolinium-enhanced T1-weighted spin-echo MR image shows significant
enhancement (arrows) around extensor carpi ulnaris tendon that
represents tenosynovitis. Note also mild enhancement in distal radioulnar
joint, which is suggestive of synovitis.