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

Patient and Methods Cerebral blood flowand 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 surgeryin a 55-year-old woman with unilateral middle cerebral arteryocclusion that occurred with intraventricular haemorrhage. Frequency analysisof slow waves measured on MEG was performed using an adaptive beam-former method.