If an aneurysm ruptures, there are obvious symptoms, most typically headache, nausea and vomiting, and even coma. The headache is very severe, often described as the most intense pain never experienced in this lifetime. Most patients are in a coma for a short period of time, usually minutes to hours, and the longer the coma, the worse the prognosis is often indicated. Upon arrival at the hospital a CT of the head is performed to confirm a subarachnoid hemorrhage, and doctors use cerebral angiography. However, most people have aneurysms that do not rupture. When they do not rupture, only a few people develop symptoms, the most common of which are headache and drooping eyelids, which are often precursors before the aneurysm ruptures. Most patients with aneurysms are asymptomatic. If you want to check whether you have an aneurysm, the safest method is currently an unenhanced MRI angiogram, which is of high quality if the field strength of the MRI machine is high enough. Whereas both enhanced MRI angiography and CTA require the injection of contrast through an IV, DSA is the most accurate test.