In recent years endoscopy has represented a terrific advancement in daily neurosurgical practice all over the world, thanks to the ability of the endoscope itself to allow an intrusive vision of the relevant anatomy with a wide and close-up view of the surgical target structures. This has proved to be very useful and widely used, mainly in the treatment of different pathologic conditions of the cerebral ventricles [4] and in transsphenoidal surgery for pituitary adenomas, and also for nonadenomatous lesions of the sellar and perisellar areas [3,6, 12, 17, 11,8]. Nevertheless, current endoscopes provide a bidimensional view, and the image as seen on the monitor is the result of a computer elaboration process. Spatial and depth information loss, however, could be overcome on one hand with the ongoing experience of the surgeon, and on the other by the capability of the human brain to elaborate secondary spatial depth cues, i.e. shadows, lights, and parallax movements [2, 13-15].
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