The author described the case of a 19-year-old man, normotensive, who developed after a blunt injury of the head haemorrhage into the left part of the mesencephalon with the symptomatology Weber's stem syndrome. Manifestation of focal symptoms was recorded three days after the injury. The cerebrospinal fluid examined on the fourth day was normal, cerebrospinal fluid one week later was blood stained. Fourteen months after this primary haemorrhage after almost complete clinical recovery a spontaneous relapse of haemorrhage occurred at the original site with the same symptomatology. Angiography was normal, haemorrhage was proved by CT and its cause was not elucidated. Haemorrhage into the brain stem of normotensive subjects is a rare and special group with a favourable prognosis and it must be differentiated from haemorrhage in hypertonic subjects.