Although there are no clearly defined recommendations on treatment of asymptomatic aneurysms, all symptomatic unruptured brain aneurysms should be treated. Endovascular therapy is an effective treatment for select cases. During this treatment, an interventional radiologist inserts a catheter into the patient's leg and uses it to guide a coil through blood vessels to the site of the aneurysm. The coil induces clotting within the aneurysm, which reduces the risk of rupture. Multiple coils may be used depending on the size. Imaging studies (DSA, CTA, or MRA) help characterize the aneurysm to decide the best course of treatment, whether endovascular coiling or surgical clipping. Endovascular coiling is associated with a reduction in procedural morbidity and mortality over surgical. For cases of ruptured aneurysms, emergent treatment is based on the type of aneurysm, and may use a combination of techniques. Conservative therapy focuses on minimizing modifiable risk factors with blood pressure control and smoking cessation.