Diagnostic and therapeutic stereotactic cerebral endoscopy.

Modern neuro-imaging caused a renewed interest in endoscopic techniques. Several indications for stereotactic endoscopy are illustrated. A prototype of a new four channel endoscope is used. Lesions in the posterior part of the third ventricle an even the fourth ventricle are reachable for biopsy. Cystic intra- or paraventricular lesions can be approached stereotactically and treated. Continuous rinsing is mandatory to preserve a clear vision.