Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 56 2 2018 02 17 137 139 EN Ebrahim Ghayem Hasankhani Department of Orthopedics and Spine Surgery, Orthopedic Research Center, Imam Reza Hospital, Mashhad University of Medical Sciences, Mashhad, Iran. Farzad Omidi-Kashani Department of Orthopedics and Spine Surgery, Orthopedic Research Center, Imam Reza Hospital, Mashhad University of Medical Sciences, Mashhad, Iran. Seyed Reza Habibzadeh Shojaie Department of Orthopedics and Spine Surgery, Orthopedic Research Center, Imam Reza Hospital, Mashhad University of Medical Sciences, Mashhad, Iran. Golnaz Ghayem Hasankhani Department of Orthopedics and Spine Surgery, Orthopedic Research Center, Ghaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran. 2016 12 07 2017 04 15 Myositis ossificans progressiva is a rare inherited disease characterized by progressive ectopic ossifications associated with thumb and big toe anomalies. Ossification usually progresses from central to the peripheral, proximal to distal, cranial to caudal, and from dorsal to ventral directions and leading to activity limitation, significant eating disability, recurrent pulmonary infection, and atelectasis. In this report, we present a 7-year-old boy with a total spine stiffness (wooden spine) seriously limited his activity of daily living. https://acta.tums.ac.ir/index.php/acta/article/view/6050 https://acta.tums.ac.ir/index.php/acta/article/download/6050/5059