The case of a 72-year-old woman with a high-partially located tumor grown within a half year to a magnitude of 8.5 x 11 x 11 cm is reported. The patient remembered a mastectomy and axillary lymphadenectomy followed by chemotherapy and radiation 8 years ago. Therefore we assumed a skeletal metastasis of a breast cancer. After wide excision, an unusual morphology was found, allowing only a classification as a pleomorphic sarcoma. Searching for the pathohistological evaluation of the former breast tumor, a cystosarcoma phylloides malignum could be found out. The tumor described here can be identified as a metastasis of this rare neoplasm.
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