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(in-TER-nul RAY-dee-AY-shun THAYR-uh-pee)
![](https://webarchive.library.unt.edu/eot2008/20090514030557im_/http://www.cancer.gov/images/spacer.gif)
| 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. |
Previous Definitions: | interleukin-4 PE38KDEL immunotoxin, interleukin-6, interleukin-7, intermediate-grade lymphoma, internal examination | Next Definitions: | International Unit, interstitial radiation therapy, intervention, intervention group, intestinal |
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