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NCI Dictionary of Cancer Terms


plaque radiotherapy  listen  (plak RAY-dee-oh-THAYR-uh-pee)

  A type of radiation therapy used to treat eye tumors. A thin piece of metal (usually gold) with radioactive seeds placed on one side is sewn onto the outside wall of the eye with the seeds aimed at the tumor. It is removed at the end of treatment, which usually lasts for several days

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Plaque radiotherapy of the eye; drawing shows a cross-section of the eye. An inset shows a plaque with radioactive seeds; it is placed on the outside of the eye with the seeds aimed at the cancer. Also shown are the sclera, choroid, retina, and optic nerve.