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Definition of Interstitial radiation therapy

Interstitial radiation therapy: Radiation treatment given by placing radioactive material directly into the target, often a tumor.

For example, in treating prostate cancer, radioactive seeds are implanted in the prostate gland. The seeds might be titanium-encased pellets containing the radioisotope iodine-125.

Interstitial radiation therapy is also called seed implantation or brachytherapy (brachys being Greek for short).

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