Because of multiforms of therapeutic possibilities in treating cavernous hemangioma, we mostly, but primarily due to frequent spontaneous regression tendency, we exercise restraint. However, if irradiation is taken into consideration, it is mainly accomplished with so-called ''conventional conditions'' with ''soft'' X-Rays (100 kV). The application of high-voltage X-Rays (1 MeV) by means of linear accelerator is seldom and rarely found in literature. That this method can be effective and indication for this is absolutely in order and life-saving, is described in an impressive case example of a congenital giant hemangioma on the right facial half of an infant irradiated with a maximum dose of only 18 Gy, where all other previous forms of therapeutic procedures had failed.