• A collective term for interstitial, intracavity, and surface radiotherapy. It uses small sealed or partly-sealed sources that may be placed on or near the body surface or within a natural body cavity or implanted directly into the tissues.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2021
• A type of radiation therapy in which radioactive material sealed in needles, seeds, wires, or catheters is placed directly into or near a tumor.
  NCI Dictionary of Cancer Terms
  U.S. National Cancer Institute, 2021
• Treatment in which a surgeon implants seeds or pellets of radioactive material in the body to destroy cancer cells.
  Harvard Dictionary of Health Terms
  Harvard Medical Publishing, 2011
• Brachytherapy (brak-e-THER-uh-pee) is a procedure that involves placing radioactive material inside your body.
  Mayo Clinic
  Mayo Foundation for Medical Education and Research