Tehran University of Medical Sciences Case Reports in Clinical Practice 2538-2683 3 4 2019 04 17 100 105 EN Babak Mirzashahi Department of Orthopedic Surgery, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran. Mohammad Firoozabadi Department of Orthopedic Surgery, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran. Furqan Khan Department of Orthopedic Surgery, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran. Mehdi Hishmatifar Department of Orthopedic Surgery, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran. 2018 08 24 2019 01 21 Enchondroma is a kind of bone hamartoma and a benign hyaline cartilage tumor. Although it is the most common benign tumor of bone, it is quite rare in the spine, especially the lumbar spine. We report a case of chondroma that was located in the lumbar spine, which extended from L2 to L5 in a 4.5-year-old child. He visited our clinic with a complaint of spine deformity and limping for 3 years. Surgical resection of large ossified mass was performed and pathologically confirmed to be a benign hamartoma of hyaline cartilage with enchondral ossification. Resection of mass released the tethering effect and balanced the growth speed of spine bilaterally. It is suggestive of a congenital developmental malformation with hamartomatous features and reactive changes. https://crcp.tums.ac.ir/index.php/crcp/article/view/211 https://crcp.tums.ac.ir/index.php/crcp/article/download/211/300