The localization of small vascular lesions within the brain-stem is the focal point of this volume which correlates clinical examination, evoked potentials, brain-stem reflexes and imaging techniques in one overview. For the first time, a group of experts has been brought together to summarize the various methods for detecting functional disturbances of specialized structures, to correlate these findings with morphologic criteria (MRI) and, finally, to elaborate patterns of abnormal findings which are characteristic of small brain-stem lesions. You are thus informed about neuro-physiological techniques which are superior to imaging techniques in local brain-stem pathology.