title: Intra-osseous synovial sarcoma.
abstract: Intra-osseous synovial sarcoma is very rare and its mode of origin is conjectural. Our patient's tumour was situated within the lower femur. The sited of origin of the few intra-osseous synovial sarcomas so far documented may support the concept of intra-osseous synovial rests.
mesh_terms: D000293:Adolescent; D005260:Female; D005266:Femoral Neoplasms / Q000473:pathology*; D006801:Humans; D013584:Sarcoma, Synovial / Q000473:pathology*