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Muscle tear outcome patterns at ultrasound follow-up of patients 20 days after treatment with platelet-rich plasma. (3a) Wide hyperechoic fibrotic tissue (*) affecting the lateral aspect of the rectur femoris (RF) muscle. (b) Deep pseudocystic lesion affecting the semi-membranosus (SM) muscle. In this case, the treated tear (*) is healed with a residual seroma (arrows).
