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a–d Volar scan of the digit of the hands by ultrasonography. a–b Longitudinal view. Mild tenosynovitis (white arrowhead) of the flexor tendon (FT) in a psoriasis patient with arthralgia. c–d Transverse view. Active tenosynovitis of the flexor tendon in an early psoriatic arthritis. Dorsal scan of the wrist. e Active tenosynovitis of the extensor digitorum tendon (EDT) in an established psoriatic arthritis
