Precise and noninvasive, stereotactic radiosurgery is proving a godsend to some noncancer patients: Its use for applications outside oncology-such as the treatment of movement disorders, arteriovenous malformations, and neuralgia-have been around almost since the commercial introduction of this technology. The noninvasive destruction of brain tumors dominates the use of this equipment, but alternate uses are picking up steam, according to Iris C. Gibbs, MD, an assistant professor of radiation oncology at the Stanford Cancer Center in California and codirector of the CyberKnife Radiosurgery Program at the Stanford Hospital and Clinics, where the CyberKnife was invented. “The results of studies with large numbers of patients help us get a sense of the factors that contribute to either the success or failure of these techniques,” Dr. Gibbs said.