Benign Phyllodes Tumor

**Semantic type:** Neoplastic Process

**Definition:** A benign, circumscribed fibroepithelial neoplasm arising from the breast and rarely the prostate gland. It is characterized by the presence of epithelial structures which are arranged in clefts and by a hypercellular mesenchymal stroma which is organized in leaf-like structures. There is no evidence of cellular atypia or sarcomatous features.

**Synonyms:** - Benign Cystosarcoma Phyllodes - Benign Phyllodes Neoplasm - Cystosarcoma phyllodes, benign - Phyllodes tumor, benign