STEREOTAXIC RADIOSURGERY OF THE FORAMEN MAGNUM REGION AND UPPER NECK LESIONS - TECHNIQUE MODIFICATION

A modification of the stereotactic radiosurgical procedure to permit t reatment of lesions in the foramen magnum and upper cervical regions i s described. The modification consists of placing the frontal pins of the stereotactic head ring in the zigoma bone, with no changes in the position of the occipital pins, so the final BRW head ring is oblique to the orbito-meatal plane. In this new position there is room enough in the posterior part of the guide for the support scrubs. This is unh ampered by the patient's shoulders and the-lesion is far enough to per mit setting the axial coordinate sufficiently above the head ring plan e.