Thirty one cases of intracranial aneurysms are studied and the results of clinical and surgical treatment analized as an initial basis for therapeutic planning in future cases. Operative mortality (3 deaths in 11 operated cases) was 27,2%. Mortality under clinical treatment (16 deaths in 20) was 80%. Clinical grading of patients according to Botterell et al.and McKissock and Walsh has shown that Botterell's classification is a useful tool for prognosis and therapeutic planning in intracranial aneurysms.