Phyllodes tumor/Definition

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Phyllodes tumor [r]: A sarcoma, or connective tissue tumor, arising from intralobular stroma of the breast. It is characterized by the rapid enlargement of an asymmetric firm mobile mass. Histologically, its leaf-like stromal clefts are lined by epithelial cells.

This definition is at least in part based on: Anonymous (2023), Phyllodes tumor (English). Medical Subject Headings. U.S. National Library of Medicine.