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[Solitary distal femoral osteosarcoma in 89-year-old woman. Case report].

The authors describe the case of an 89-year-old patient with a one-month history of pain in the right knee and a pathological fracture of the distal femur. Excisional biopsy showed a classical osteogenic sarcoma. The patient died after six months of palliative surgical and oncological therapy; her primary disease generalised and progressed with numerous metastases. The authors discuss the possibilities of histological diagnostics of osteogenic sarcoma and its differential diagnosis. They draw attention to a possible occurrence of this type of sarcoma also in elderly patients, and not only in adolescents.