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A 13-year-old boy with bilateral heel pain who was eventually diagnosed as enthesitis-related arthritis. Comparative ultrasound evaluations (longitudinal view) demonstrate increased thickness, and edema of the right achilles tendon (A). The paratenon is blurred (white arrow heads) and there are irregularities (white arrows) at the insertion site on calcaneus (C) (right image). The echogenicity of Kager's fat pad (K) is also irregular on both sides.
