Congenital pseudarthrosis. A, Radiograph of 3-year-old child with established nonunion present since birth. B, Intraoperative photo of hamartomatous tissue. C, Postoperative radiograph demonstrating stabilization of tibia using telescoping intramedullary rod following surgical debridement, iliac crest bone graft, and bone morphogenetic protein placement. D, Healed nonunion 10 months postoperatively.