Gamma knife surgery for cerebral metastasis.

Twenty-six cerebral metastatic tumours treated with the Gamma knife employing a large single dose were followed by repeated clinical and CT examinations. In most cases Gamma knife surgery was the only treatment. The follow up time has been longer than 6 months with a median follow up of 9 months. In all but one of the cases a remarkable progressive shrinkage of the tumour started 2-4 months after the therapy. The therapeutic results indicate that radiosurgery used even as the only form of treatment is the best treatment alternative for cerebral metastasis presently available.