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How is radiation therapy used to treat intraocular melanoma?

Radiation therapy may be used to treat intraocular melanoma by killing the cancerous cells. There are two types of radiation therapy: external and internal. The most common type of external radiation therapy usually involves aiming high-energy beams of radiation such as X-rays specifically at the melanoma growth to destroy the cancer. Sometimes, doctors may treat intraocular melanoma with brachytherapy, or localized plaque radiation therapy, which is a type of internal radiation therapy that involves implanting a small plaque that contains radioactive "seeds" against the eye and leaving it there to deliver radiation for a few days.

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