A 33 year-old hypertensive woman presented with a pure, acute, pseudobulbar palsy, two years after a right transient facio-brachial hemiplegia. C.T. scan showed two areas of low density projecting over the junction of the internal capsule with the corona radiata, at the external border of the lateral ventricles. They involved the territories of both posterolateral choroidal arteries, at the junction with those of the external lenticulostriatal arteries. Clinical data, clinico-pathological correlations in pseudobulbar palsies, and new concepts about the corticobulbar tract anatomy are discussed with evidence from this case.