Microsurgical Clipping and Endovascular Embolization Comparative Prospective Randomized Trial

Inclusion Criteria: * Patients with ruptured (acute SAH) or unruptured cerebral aneurysm who require surgical treatment (clipping and / or embolization) * Both male and female * Age from 18 to 80 years * Informed consent to participate in the study signed by the patient. If the patient cannot give consent, informed consent is signed by closest relatives or based on the results of a medical concilium * The patient (legal representative) agrees to a clinical assessment (examination and / or telephone visit) within 6 months and 12 months and to an angiographic control after 12 months * Patient has not previously been randomized to this or other ongoing study * Aneurysm has not previously been treated with endovascular embolization or microsurgical clipping Exclusion Criteria: * The target aneurysm has been treated (embolization or clipping) before * Severe clinical condition of the patient (Glasgow coma scale \<4, unstable hemodynamics) * Lack of signed informed consent * Severe medical or surgical comorbidity in which the patient's life expectancy is less than 2 years * Pregnancy, breastfeeding