Breast Phyllodes Tumor

**Semantic type:** Neoplastic Process

**Definition:** A benign, malignant, or borderline circumscribed biphasic neoplasm that arises from the breast. It usually affects middle-aged women. It is characterized by the presence of a double layer of epithelial cells that are arranged in clefts, surrounded by a spindle cell mesenchymal (stromal) component.

**Synonyms:** - Breast Cystosarcoma Phyllodes - Breast Phyllodes Neoplasm - Cystosarcoma Phyllodes of Breast - Cystosarcoma Phyllodes of the Breast - Cystosarcoma phylloides - breast - Cystosarcoma phylloides of the breast - Phyllodes Breast Neoplasm - Phyllodes Breast Tumor - Phyllodes Neoplasm of Breast - Phyllodes Neoplasm of the Breast - Phyllodes Tumor of Breast - Phyllodes Tumor of the Breast