It has sometimes been said, perhaps unfairly, that radiosurgery has been a treatment looking for a successful application. This volume, the second in the series on radiosurgery, attempts, in some parts more successfully than others, to refute that suggestion. The technique was first established by Lexsell, using a collimated cobalt source (“the gamma knife”). In the United Kingdom, the Stereotactic Radiosurgery Centre in Sheffield has been treating patients since 1985. The published results for treatment of arteriovenous malformations have been good and its place in the non-operative management of cerebral arteriovenous malformations is now secure. …