An anatomoclinical study has been performed on 5 cases with thalamic hemorrhages. The clinical picture occurring in elderly hypertensive subjects was constituted by a sudden hemiparesis or hemiplegia with bilateral miosis and Babinski signs, inconstant involvement of sensation, bloody CSF, frequent initial improvement followed by sudden impairment. When the hemorrhage involved the dominant thalamus, a mixed aphasia occurred. Anatomically, a massive hemorrhage of the thalamus occurred in all cases. These findings are discussed.