Cerebral vasospasm can be defined as the focal or diffuse narrowing of the large and medium caliber capacitance arteries at the base of the brain that follows a hemorrhage in the subarachnoid space. Aneurysmal subarachnoid haemorrhage is the major etiology for vasospasm, although it has also been seen after bleeding from an arteriovenous malformation, tumors, or traumatic brain injury. Its diagnosis is not always easy, and may have a temporary course; May be completely asymptomatic or be confused with another complication associated with subarachnoid hemorrhage. However, in more than 50 percent of cases, vasospasm is manifested by a delayed-onset neurological deficit, which can resolve and progress to permanent cerebral infarction.