Figure 6: Medial epicondylitis ultrasound-guided infiltration. Note: (A) The bony prominence of medial epicondyle (ME) is easily recognizable (asterisk). The needle (arrowheads) is positioned in the peritendinous soft tissue, near the tendon insertion. (B) The O2-O3 mixture (arrows) appears as hyperechoic area in the peritendinous soft tissue with a well-defined shadow that obscures the medial epicondyle below. The images were obtained by means of a Sonoscape P50 Ultrasound (Sonoscape Europe s.r.l., Rome, Italy). The O2-O3 mixture was produced by means of a Multiossigen Medical 99IR generator (Multiossigen S.p.A., Gorle, Bergamo, Italy).