[A Case of a Malignant Phyllodes Tumor of the Breast with Osteogenic Sarcoma Which Repeated Local Recurrence].

The patient is a 39-year-old woman. At the age of 34, she recognized a 22 mm sized mass in the upper outer quadrant of her right breast, which was diagnosed as a fibroadenoma. 5 years later, the mass increased to 45 mm.