Phyllodes tumor was suspected. Underwent incision and drainage of necrotic material from the tumor. Material sent for pathology:

Fragments of malignant phyllodes tumor, high grade. Wide areas of necrosis seen.
Immunostains: PAN- CK, ER, and PR positive in epithelial component. Vimentin, CKIT, CD34 (focally weakly), and P53 positive in stromal component. P63 negative.