Phyllodes Tumor : Low-grade
Phyllodes tumor is a biphasic tumor and consists of hypercellular stroma underneath the cleft-like spaces lined by benign glandular epithelium. There are overalapping histologic features between fibroadenoma and phyllodes tumor. The amount and appearance of stroma helps distinguish between the two. Size larger than 4 cm and a history of rapid growth favors the diagnosis of phyllodes tumor.