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Primary osteosarcoma of the breast.

Primary extra-osseous osteogenic sarcomas have been reported in many tissues of the body but their occurrence in the breast is rare. The tumor has poor prognosis with high risk of recurrence and hematogenous spread, most commonly to the lungs. We report a case of primary osteosarcoma of the breast occurring in a 58-year old woman. Histo-pathological examination revealed pleomorphic tumor cells with osteoid formation and positivity for immuno-histochemical stain vimentin.