Intracavitary radiation therapy

Definition of intracavitary radiation therapy
National Cancer Institute

intracavitary radiation therapy

(IN-truh-KA-vih-tayr-ee RAY-dee-AY-shun THAYR-uh-pee)
A type of internal radiation therapy in which radioactive material sealed in needles, seeds, wires, or catheters is placed directly into a body cavity such as the chest cavity or the vagina.

Source: NCI Dictionary of Cancer Terms