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Breast cancer is the most prevalent tumor worldwide among women. Despite the fact that overall survival reaches figures close to 90%, it continues to be an important health and economic problem for the population. Primary breast sarcomas account for less than 1% of these neoplasms but their rates of recurrence and mortality are high. Given that there are no specific imaging tests for diagnosis, confirmation of this entity is a challenge at the histopathological level. The treatment of the OSM is mainly surgical with the removal of the tumor with adequate margins, which will be transcendental for the prognosis of the patients. It has not been demonstrated that an axillary dissection is required, nor a standard adjuvant treatment of chemotherapy or radiotherapy, unless indicated. We present the case of a postmenopausal patient who, after having developed a ductal carcinoma in situ of the breast (DCIS) successfully treated, developed two years after the end of the radiotherapy treatment, and in the same location of the initial tumor, an osteosarcoma primary breast of rapid growth attributable to the effect of radiotherapy administered.

Osteosarcoma primario de mama en una paciente con antecedentes de tratamiento radioterápico loco-regional por carcinoma in situ mamario