Principles and Practice of Radiation Therapy in Exotic and Avian Species

Radiation therapy has long played a significant role in the treatment of cancer in people, dogs, and cats. Recently, this technology has been applied to small mammal, avian, and reptile species with some success. Radiation therapy may play an important role in the control of locally aggressive tumors and has been used in both definitive and palliative settings. However, there are some special challenges that must be overcome to successfully treat these species with radiation therapy and, in many cases, little is known about the natural behavior of the tumors being treated. This article introduces some of the basic tenets of radiation oncology, while addressing some of the aspects of radiation biology that are problematic when treating very small or air-filled patients. Much work needs to be done to define fractionation schemes and field geometries that will allow avian and exotic pets to be safely and effectively irradiated.