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Ultrasound imaging of synovitis and tenosynovitis. a Flexor tenosynovitis in transverse (left) and longitudinal (right) views. b Metacarpophalangeal joint paratenonitis, dorsal aspect of second metacarpophalangeal joint. MC, metacarpal. c Dorsal proximal interphalangeal B-mode (left) and power Doppler (right) images indicating synovitis in the recess (asterisk). PP, proximal phalanx; MP, middle phalanx; ET, extensor digitorum tendon. d Positive power Doppler signal of finger pulp
