Breast sarcoma is a rare and aggressive form of cancer that is often difficult to diagnose and treat due to its rarity and lack of consensus on management. This case series presents two cases of breast sarcoma in women with no notable medical history, highlighting the importance of early detection and proper management in improving patient outcomes. The first case involves a 45-year-old woman who presented with a rapidly growing mass in her right breast, which was later diagnosed as a malignant phyllodes tumor. The second case involves a 26-year-old woman who underwent multiple surgeries for a recurrence of a high-grade phyllodes tumor in her right breast. The rarity of breast sarcoma makes it challenging to establish standardized treatment protocols, and further research is needed to determine the most effective treatment options. In this context, multidisciplinary collaboration and specialized centers for sarcoma management play a critical role in providing optimal care to patients with breast sarcoma.