-A retrospective analysis of 50 patients who suffered subarachnoid hemorrhage (SAH) treated at UNICAMP between April 1988 and March 1992 is made, distributed as 34% in Hunt & Hess grade 1,38% in grade II, 16% in grade III, and 12% in grade IV. Males were predominant (66.6%), and patients age varied around 47± 12.13 years old. Only 13 patients (26%) were admitted within the first 24 hours after bleeding, with an overall average of 20.45 days of delay. From all cases only one had a rebleeding, survived and was submitted to surgery. Four patients died after surgery (8%). Timing of operation and prognostic chances were available, being 27.30 days after SAH for Hunt & Hess group I. It is analyzed also the timing for diagnosis -which responded for the most delay, and treatment for the other groups, and a historical comparison with previous series since year 1956 of the same Hospital were documented. Good results were observed in 38 cases (76%). The overall results in terms of mortality and morbidity is, in comparison, in accordance with the literature, and is ameliorated from the past series due to technical improvement, despite worsen difficulties in managing admittance, diagnosis and treatment faster, which is required to deal with the disease.KEY WORDS: subarachnoid hemorrhage, cerebral aneurysm, cerebral vasospasm.Aneurismas cerebrais: análise de 50 casos operados e comparação com séries anteriores RESUMO -Revisão cirúrgica de 50 pacientes portadores de aneurisma cerebral é realizada. O "timing "cirúrgico e prognóstico é bem documentado e comparado com séries anteriormente publicadas . A demora em se operar os pacientes foi devida à dificuldade de se realizar o diagnóstico (CT e angiografia). Observamos bons resultados em 38 casos (76%) e a taxa de mortalidade foi de 8% (4 casos). Os resultados finais estão, em comparação com a literatura, dentro do aceitável. PALAVRAS-CHAVE: hemorragia meníngea, aneurisma cerebral, vasoespasmo. The brain is unique among the organs of the body since it has no regenerative power and the highest metabolic needs. A ruptured cerebral aneurysm has the nefast property of causing subtle catastrophyc hemorrhages in the working brain, though bringing high morbidity and mortality to previously healthy individuals. This frequent course of subarachnoid hemorrhage (SAH) due to cerebral aneurysm has led to many attempts to ameliorate diagnosis and treatment, and several improvements were achieved analyzing the timing of onset of symptoms and clinical or surgical characteristics of series of patients who suffered from SAH, since the prevention of rupture of an intact and asymptomatic aneurysm still remains a dilemma l4I5lli . Delayed ischemic deficits due to cerebral vasospasm are well known. Several drugs have been evaluated in order to plead in favor of a better patient outcome [1][2][3][4][5][6][12][13][14]