We report an atypical Wallenberg syndrome presented with an acute vertigo, preceded by headache, simulating a peripheral vestibular pathology. The first Magnetic Resonance Imaging (MRI) study done in urgencies is negative. Presence of headache, strong lateral ataxia and secondary focally neurological symptoms 48 h after the beginning of the crises, lead to a repetition of the MRI which shows a right lateral bulbar infarct. We focus on the semiological elements that can guide us to a lateral bulbar pathology in patients with pseudoperypheric symptoms (axial latero-pulsion, ocular laterodeviation, posterior headache, oculographic test, etc.).