Radiation Therapy
Overview Conditions Radiation therapy (also called radiotherapy) is the use of high-energy rays to destroy tumor cells and stop them from growing and multiplying. Radiation therapy is a local therapy. This means that it affects only the cells targeted. It does not harm cells elsewhere in the body or even elsewhere in the brain or spinal cord. The therapy is administered in one of two ways: External radiation uses a high-energy beam of radiation targeted at the tumor. The beam travels through the skin, the skull, healthy brain tissue and other tissues to get at the tumor.