Abstract
Introduction: Post-irradiation mammary stromal sarcoma (MSS) is a rare condition, and it is worth learning new knowledge from each case. Case Presentation: We present the case report of a 59-year-old female with a medical history of breast cancer, who presented with an axillary mass on the same side. The patient was further evaluated and finally diagnosed with MSS with chondroid differentiation. Thereafter, she underwent neoadjuvant chemotherapy to facilitate the surgical resection of the tumor. However, she experienced local progression and lung metastasis during chemotherapy. Conclusions: MSS with chondroid differentiation was resistant to the standard chemotherapy regimens of sarcoma. Radiotherapy is a potential choice in the case of chemoresistant MSS. Further trials may reveal this notion.
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