Bilateral Stereotaxic Lesions in the Management of Parkinsonism and the Dyskinesias.

Since the establishment of stereotaxic surgery as a therapeutic procedure of value in the management of Parkinsonism and the dyskinesias, most centres specializing in this operation have carried it out bilaterally in some of their patients. However, bilateral stereotaxic surgery has been associated with a certain amount of hazard, somewhat greater than in the case of unilateral operations. There has been a general reluctance to subject these patients to operation on both hemispheres, and the criteria for selection for surgery have been more strictly applied before the second procedure.