Primary epiphyseal localization of primitive neuroectodermal tumor in a child

Primary epiphyseal lesions in children are rare and usually benign, with chondroblastoma being the most typical for this location and age. Very occasionally, malignant bone tumors may occur primary within long bones epiphyses during growth; few reports are given on such single cases in orthopedic and radiological scientific literature. This paper presents a case report on a malignant primitive neuroectodermal tumor affecting primary distal femoral epiphysis in a child, having a benign-looking lytic appearance. Short literature review and discussion on possible differential diagnosis of such lesion is also included.