![](https://webarchive.library.unt.edu/eot2008/20090514030437im_/http://www.cancer.gov/images/spacer.gif) |
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(IN-ter-STIH-shul RAY-dee-AY-shun THAYR-uh-pee)
![](https://webarchive.library.unt.edu/eot2008/20090514030437im_/http://www.cancer.gov/images/spacer.gif)
| A type of internal radiation therapy in which radioactive material sealed in needles, seeds, wires, or catheters is placed directly into a tumor or body tissue. |
Previous Definitions: | interleukin-7, intermediate-grade lymphoma, internal examination, internal radiation therapy, International Unit | Next Definitions: | intervention, intervention group, intestinal, intestinal villi, intestine |
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![](https://webarchive.library.unt.edu/eot2008/20090514030437im_/http://www.cancer.gov/images/spacer.gif) |