Electroencephalographic features in patients with Moyamoya disease

Moyamoya disease (MMD) is a chronic, occlusive cerebrovascular disease with an uncertain etiology characterized by bilateral steno-occlusive changes at the terminal portion of the internal carotid artery and an abnormal vascular network at the base of the brain. In view of the abnormal pathology of this progressive cerebral vasculopathy, it is not difficult to understand the recurrent and stereotyped symptoms in MMD, such as transient ischemic attack (TIA), ischemic, or hemorrhagic stroke. Seizure is another prominent transient event in MMD, with a prevalence of 30% in adults. Therefore, diagnostic and therapeutic dilemma arises from these transient neurological events. Electroencephalography (EEG) is not commonly used as a diagnostic tool in MMD. However, it can play a relatively role in the differential diagnosis of TIA-like symptoms