Periosteal new bone formation in a child

A periosteal reaction is the formation of new bone in response to injury or other stimuli of the periosteum surrounding the bone. It is most often identified on X-ray films of the bones. [Source: Wikipedia ]

May Be Caused by

Common: Arthritis; Battered child syndrome; Bone sarcoma; Burkitt lymphoma; Campomelic dysplasia; Congenital transplacental infection; Dactylitis; Embryonal rhabdomyosarcoma metastasis; Ewing sarcoma; Fungal arthritis; Healing rickets; Juvenile chronic arthritis; Juvenile rheumatoid arthritis; Langerhans cell histiocytosis; Leukemia; Metastasis; Neuroblastoma metastasis; Osteogenesis imperfecta; Osteomyelitis; Osteosarcoma; Physiologic periostitis of the newborn; Prematurity; Retinoblastoma metastasis; Septic arthritis; Sickle cell disease; Stress fracture; Trauma; Traumatic callus formation; Traumatic periostitis
Uncommon: Benign bone cyst or neoplasm with expansion or pathologic fracture; Caffey disease; Cellulitis; Christmas disease; Decubitus ulcer; Deep abscess; Diabetic ulcer; Diaphyseal dysplasia; Gaucher disease; GM1 gangliosidosis; Hemophilia; Hyperphosphatasia; Hypertrophic osteoarthropathy; Hypervitaminosis A; Hypervitaminosis D; Idiopathic; Infantile multisystem inflammatory disease; Melorheostosis; Menkes disease; Methotrexate; Mucolipidosis type 2; Niemann-Pick disease; Nutritional copper deficiency; Osteoid osteoma; Pachydermoperiostosis; Prostaglandin E; Radiation injury; Scurvy; Thermal injury; Tuberous sclerosis; Vascular tumor; Yaws