Recovery of spontaneous neuromagnetic activity after extracranial–intracranial bypass in a patient with middle cerebral artery occlusion

Patient and Methods Cerebral blood flow and neuromagnetic activity were measured using 123I-iodoamphetamine-single photon emission computed tomography (IMP-SPECT) and magnetoencephalography (MEG), before and after extracranial–intracranial (EC–IC) bypass surgery in a 55-year-old woman with unilateral middle cerebral artery occlusion that occurred with intraventricular haemorrhage. Frequency analysis of slow waves measured on MEG was performed using an adaptive beam-former method.