The child with bone pain: malignancies and mimickers.

Bone pain in children is common. The cause may be as benign as growing pains or as life-threatening as a malignancy. When a cause cannot be established by laboratory tests, physical examination or patient history, imaging of the affected body part is often obtained. Distinguishing benign from malignant processes involving the bones of children, based on imaging findings, can be challenging. The most common benign conditions that mimic pediatric bone tumors on imaging are Langerhan's cell histiocytosis and osteomyelitis. In this review, the current literature regarding the pathology and imaging of these conditions is reviewed. Benign conditions are compared with the most common pediatric bone tumors, Ewing sarcoma and osteosarcoma, with an emphasis on clinical and imaging features that may aid in diagnosis.