• A benign, borderline, or malignant fibroepithelial neoplasm arising from the breast and rarely the prostate gland. It may recur following resection. The recurrence rates are higher for borderline and malignant phyllodes tumors. In borderline and malignant phyllodes tumors metastases to distant anatomic sites can occur. The incidence of metastases is higher in malignant phyllodes tumors.
  NCI
  U.S. National Cancer Institute, 2021
• A type of connective tissue neoplasm typically 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. Rare phyllodes tumor of the prostate is also known.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• A type of tumor found in breast or prostate tissue. It is often large and bulky and grows quickly. It may be benign (not cancer) or malignant (cancer) and may spread to other parts of the body.
  NCI Dictionary of Cancer Terms
  U.S. National Cancer Institute, 2021
• Phyllodes tumor is a nonepithelial breast tumor that may be benign or malignant. Phyllodes tumors are frequently large (4 to 5 cm) at diagnosis. About half are malignant, accounting for 1% of breast cancers. Between 20% and 35% of these tumors recur locally, and distant metastases occur in 10 to 20% of patients.
  Merck Manuals
  Merck & Co., Inc., 2025
• Cystosarcoma phyllodes is a rare, predominantly benign tumor that occurs almost exclusively in the female breast. Its name is derived from the Greek words sarcoma (
  Medscape
  WebMD, 2025