PERIMESENCEPHALIC SUBARACHNOID HEMORRHAGE - CLINICAL AND CT ASPECTS

Aim: The blood distribution on CCT and the prognosis of patients with nonaneurysmal subarachnoidal haemorrhage were retrospectively studied and compared to a patient group with aneurysmal haemorrhage. Methods: The blood distribution on CCT (72 h after bleeding episode) of 26 pati ents with nonaneurysmal subarachnoidal haemorrhage confirmed by two no rmal cerebral angiograms was compared to the blood distribution of 76 patients with aneurysmal haemorrhage. The clinical condition of these patients was further analysed, 4-60 months after the bleeding episode. Results: In 62% of patients with nonaneurysmal haemorrhage the blood distribution was perimesencephalic. The aneurysmal blood distribution pattern was more extended and only one patient showed a perimesencepha lic pattern. 80% of the patients without aneurysms in angiography had no limitations in daily functional capacity. Conclusion: The perimesen cephalic pattern is frequently found in patients with nonaneurysmal su barachnoidal haemorrhage, the prognosis of these patients is excellent . Rarely is the perimesencephalic haemorrhage caused by a ruptured ane urysm. It needs thorough angiographic evaluation.