Role of radiation
External beam radiation (often with IMRT/IGRT) can treat the prostate and, when needed, nearby lymph nodes. Stereotactic radiotherapy / SBRT may be an option for selected patients in fewer sessions. Brachytherapy (internal radiation) is another approach for some men, alone or with external beam. Radiation is also used after surgery if PSA rises or if high-risk features are found, and to treat metastatic spots that cause pain.
Modern planning aims to cover the prostate while limiting dose to the bladder, rectum, and other nearby structures.
