The aim of the study was to present clinical neurootological symptoms in the case of early stage of the fourth ventricle tumor diagnosed finally on the base of MRI. Visual-oculomotor, vestibular-oculomotor, vestibulo-spinal and other electrophysiological signs of the vestibular damage of the brainstem were: paresis of the sixth nerve unilaterally, prolonged latency of III-V waves on brain stem audiological responses (BERA), asymmetry of the fusion limit of optokinetic nystagmus, bilateral areflexia of the caloric and kinetic labyrinth reaction, abnormal Unterberger's test in craniocorpography, the presence of gaze nystagmus. The study stressed the value of the widen and careful neurootological examination in such cases.