Die spontane perimesenzephale Subarachnoidalblutung (PMH)

Perimesencephalic subarachnoidal haemorrhage (PMH) is characterized by a typical blood distribution pattern in the basal cysterns in the CAT, missing evidence of an aneurysm in the panangiogram, a mild clinical course and a very positive prognosis. Between 1990 and 1995, 108 inpatients with non-traumatic subarachnoidal haemorrhage were treated in our clinic. Within this group 14 patients (13%) were identified retrospectively with a perimesencephalic haemorrhage distribution pattern in the CAT and a negative panangiogram. These patients experienced a mild clinical course with excellent outcome without rebleeding during the observation period of 2 to 50 months. All patients were fully able to work, and only two patients complained of frequent headaches. The mild clinical course, the negative panangiogram as well as the extremely positive outcome confirm the hypothesis of of a benign subgroup of non-traumatic subarachnoidal haemorrhages.