internal radiation therapy(in-TER-nul RAY-dee-AY-shun THAYR-uh-pee) A type of radiation therapy in which radioactive material sealed in needles, seeds, wires, or catheters is placed directly into or near a tumor. Also called brachytherapy, implant radiation therapy, and radiation brachytherapy. What To Know About Brachytherapy (A Type of Internal Radiation Therapy) Informaci??n para pacientes que reciben radioterapia |