Gamma Knife® technology delivers a highly precise form of radiosurgery called stereotactic radiosurgery. It is a non-invasive alternative to neurosurgery which uses radioactive sources to predominantly treat brain tumours. Malignant or benign brain tumours may be treated with the Gamma Knife, and can be performed on an outpatient basis, thus reducing the risk of complications and side effects. Multiple lesions can also be treated simultaneously and accurately64. At present, Gamma Knife radiosurgery is available in Australia at the Princess Alexandra Hospital, Brisbane, and at Macquarie University Hospital, Sydney. A patient information video on Gamma Knife discusses the mechanism and benefits of Gamma Knife technology.