Frequent ischemic events related to varying middle cerebral artery stenosis.

We herein present the cases of two patients with multiple ischemic events, presumably due to varying degrees of middle cerebral artery (MCA) stenosis. The first patient was treated medically, and the symptoms and degree of MCA stenosis varied over several months. The second patient received emergent bypass surgery and experienced no further events, although the MCA stenosis progressed over four months. Emergent intracranial bypass surgery is an option for preventing further ischemic events in patients with symptomatic MCA stenosis.