A brain aneurysm is a bulge that forms in the blood vessel of your brain that could lead to severe health issues and possibly death but most brain aneurysms dont cause any symptoms and only a small percentage of them result in health problems. Learn about detection diagnosis treatment options and advances for brain aneurysm including surgical clipping endovascular coiling and flow diverters. Warning signs symptoms unruptured brain aneurysms are typically completely asymptomatic these aneurysms are typically small in size usually less than one half inch in diameter. Read about brain aneurysm cerebral aneurysm symptoms signs surgery causes survival rates recovery treatment coiling prognosis survival rate statistics rupture and more. A brain aneurysm occurs when a weak area in a brain artery bulges and fills with blood it can be life threatening and should be met with urgent emergency care