MR angiography combined with ultrasound is sensitive and specific in identifying arterial occlusions and stenosis caused by embolic events, which can be missed by CT. The normal flow void in the symptomatic artery i.e the early ischaemic changes can be detected by MR imaging. MRI provides detail information of the pathophysiological aspects of cerebral ischemia. It specifically detects brain areas with ischemic cell swelling and to identify deposits of hemoglobin degradation within the brain parenchyma. MRI is also helpful in assessing ischemic edema, perfusion disturbance, mass defect, arterial wall obstruction.