Traditionally, stereotactic irradiation has been delivered in a one session as single fraction radiosurgery. High doses of radiation given in one fraction are known to be associated with a high risk of radiation induced damage to normal tissue and this is particularly true for the central nervous system. Giving radiation in small individual doses allows the delivery of higher radiation doses without serious injury to the normal tissues, which is especially important for normal CNS structures. Single fraction SRS has been shown to be associated with considerable neurological toxicity to the optic apparatus the cranial nerves and normal brain. With the application of high precision relocatable non-invasive means of immobilisation, it has become possible to deliver stereotactic irradiation in a fractionated manner. The technique of SCRT combines the precision of focused radiation delivery and the radiobiological advantages of fractionation. It also ensures homogenous dose distribution within the irradiated volume further reducing the risk of damage.