Limping as the first manifestation of peripheral primitive neuroectodermal tumor (PNET) in children

Background: Ewing sarcoma (ES) and peripheral primitive neuroectodermal tumor (PNET) comprise the same spectrum of neoplastic diseases known as the Ewing sarcoma family of tumors (EFT). Ewing sarcoma is the most common bone sarcoma typically arising from bone and is one of the most common pediatric solid tumors. It mostly affects the bones of the lower parts of the body.