Stereotactic radiosurgery techniques using the gamma unit and linear accelerator are reviewed. Both methods are employed in the treatment of a variety of intracranial lesions. Radiosurgery is particularly effective in the treatment of arteriovenous malformations and metastatic tumours. Results for the treatment of other tumours such as malignant gliomas, acoustic neuromas, meningiomas, and pituitary tumours are encouraging.