[A Surgical Case of a Giant Malignant Phyllodes Tumor of the Breast].

A 46-year-old woman experienced bleeding from a large tumor in her right breast and was hospitalized after calling an ambulance. At first, we suspected breast cancer, but a core needle biopsy under ultrasound revealed a diagnosis of malignant phyllodes tumor. The bleeding was temporarily controlled using Mohs paste, so emergency surgery was not required. After mastectomy, skin grafting was not needed. Postoperative adjuvant therapy was not planned. 12 months after surgery, recurrence was detected in the lower lobe of the left lung, and we performed a laparoscopic-assisted left lower lobe lung resection. Future recurrences will be managed with chemotherapy and radiation therapy according to sarcoma treatment protocols, and surgery will be considered for operable sites.