Fig. 1.

a–b Dorsal scan of the Achilles tendon. a–b Longitudinal view. Active enthesitis with loss of the tightly packed echogenic lines (white asterisks) and concomitant PD signal at bone insertion in a psoriatic arthralgia patient. c Lateral scan on the elbow. Active enthesitis of the common extensor tendon enthesis in an early psoriatic arthritis. d Plantar fascia. Thickening of the plantar fascia in a psoriasis patient. AT, Achilles tendon; C calcaneus; CET common extensor tendon enthesis; PF plantar fascia