Metastatic primary angiosarcoma of the breast in a pediatric patient with a complete response to systemic chemotherapy and definitive radiation therapy: case report and review of the literature.

We present a case of a rare malignancy, primary breast angiosarcoma, in a 15-year-old girl. She presented with a locally advanced tumor and suspected metastatic disease to the mediastinum and bones on PET imaging. The patient was treated with systemic chemotherapy and definitive radiation therapy to her left breast and achieved a complete response. She has no evidence of disease recurrence 44 months from her initial diagnosis.