Intraoperative electroencephalography changes in unilateral moyamoya phenomenon

INTRODUCTION

Moyamoya phenomenon is the proliferation and profuse collateral formation in distal branches of occluded unilateral or bilateral distal internal carotid artery (ICA) in presence of some associated condition like atherosclerosis, meningitis, vasculitis, sickle cell disease, etc., In the absence of any associated condition, the term used is moyamoya disease.[1] We report a case of moyamoya phenomenon due to encasement of ICA by an optochiasmatic glioma and characteristic electroencephalography (EEG) changes observed intraoperatively and postoperatively.

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