A 43-year-old woman developed during post-partum an axial amnesia of ischemic origin. Stereotactic correlations were obtained by matching CT scan images with the true reference plane of the examination, according to an original method. This led to the diagnosis of infarction in the territory of a paramedian thalamomesencephalic artery. The amnesia probably resulted from bilateral lesions of Vicq d'Azyr's bundle. Atypical features in this case were the absence of disorder of vigilance and oculomotor disorders. This striking fact in this patient was recovery of some recognition capability contrasting with the persistence of a major evocation disorder.