Fig. 3

Metaphysis (M) look like erosions; epiphysis (E) and unossified bones are anechoic, like synovial effusion (a,b). Physiological vascularization at insertion of enthesis to the cartilage can be frequently detected, resembling enthesitis (c). Feeding vessels can be intraarticular or close to ossifying nuclei, and must not be considered as signs of active synovitis (d). a. Dorsal longitudinal scan of the II metacarpophalangeal joint in a 2 years old child, grey-scale. b. Longitudinal medial scan of the suprapatellar recess in a 2 years old child, grey-scale. c. Longitudinal scan of the Achilles tendon at insertion to the calcaneus in a 5 years old child, power Doppler d. Longitudinal medial scan of the suprapatellar recess in a 5 years old child, power Doppler