A radiation treatment that uses a machine to aim high-energy radiation at the cancerous tissue. For carcinoid it is mainly used for painful bone metastases but is also useful for brain metastases and is useful for incompletely resected or recurrent carcinoid of the thymus. There is also some experience indicating possible limited usefulness for EBR in treating inoperable mediastinal metastases from very aggressive atypical carcinoids of the lung. In the presence of renal insufficiency when radiographic iodine containing contrast cannot be used for angiogram External Beam Radiation (EBR) could have application in very selective cases. Multi beam EBR has no use and is unsafe to debulk multiple liver metastases.