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Ectopic chondrosarcoma Achilles tendon. a Preoperative planning on a flap based on posterior tibial artery perforators. b Intraoperative defect after surgical excision and Achilles tendon reconstruction with an allograft. c New surgical planning after excision. d Postoperative view with the propeller flap turned around the perforator vessel 170° and direct closure. e, f Aesthetic and functional result (follow-up 6 months) (Case 2, Table 1)
