en Orthopedic surgery Case & Review Case & Review <span style="font-size:12pt"><span style="font-family:Calibri,sans-serif">Langerhans cell histiocytosis (LCH) is an uncommon hematological disorder-affecting infant and young child.</span></span><br> <span style="font-size:12pt"><span style="font-family:Calibri,sans-serif">LCH is a rare disorder of the reticuloendothelial system associated with proliferation of</span></span><br> <span style="font-size:12pt"><span style="font-family:Calibri,sans-serif">Langerhans cells and mature eosinophils.</span></span><br> <span style="font-size:12pt"><span style="font-family:Calibri,sans-serif">LCH can involve any bone, but the most common are pelvis, ribs, skull, long bones, vertebra, and facial bones.</span></span><br> <span style="font-size:12pt"><span style="font-family:Calibri,sans-serif">In this article, we report a case of LCH in a 15-months-old child involving the scapula and round shape swelling on left scapula with no erythema or tenderness and normal passive range of motion of shoulder and also aggressive periosteal reaction led to the diagnosis of LCH.</span></span><br> <span style="font-size:12pt"><span style="font-family:Calibri,sans-serif">This patient undergone surgery and received chemotherapy with no complications or any recurrence after two years follow up</span></span><br> <span style="font-size:12pt"><span style="font-family:Calibri,sans-serif">The purpose of reporting this case is to discuss clinical and radiological and histopathology features of LCH and role of doctors in diagnosing and managing such lesions.</span></span><br> &nbsp; Langerhans cell histiocytosis, LCH, scapula 133 134 http://jpr.mazums.ac.ir/browse.php?a_code=A-10-1015-1&slc_lang=en&sid=1 Mehran Razavipour razavimehran@yahoo.com 10031947532846008386 10031947532846008386 No Assistant professor of orthopedic surgery, Orthopedic research center, Mazandaran university of medical science, Sari, Iran. Salman Ghaffari orthosalman@yahoo.com 10031947532846008387 10031947532846008387 No Associate professor of orthopedic surgery, Orthopedic research center, Mazandaran university of medical science, Sari, Iran Soroosh Fateh soroushfateh@yahoo.com 10031947532846008388 10031947532846008388 No Resident of orthopedic surgery, Orthopedic research center, Mazandaran university of medical science, Sari, Iran Mahdi Ahmadi med.ahmadi@gmail.com 10031947532846008389 10031947532846008389 Yes Resident of orthopedic surgery, Orthopedic research center, Mazandaran university of medical science, Sari, Iran