• Makoto Katsuno, Eitaro Ishisaka, Kiyotaka Toyota, Kazutsune Kawasaki, and Izumi Inaba.
• Department of Neurosurgery, Doutou Neurosurgical Hospital, Kitami, Hokkaido, Japan. Electronic address: mkatsuno@nms.ac.jp.
• World Neurosurg. 2018 Oct 1; 118: 75-80.

BackgroundAlthough it is well-known that vertebrobasilar insufficiency (VBI) because of atherothrombosis with bilateral vertebral artery (VA) occlusion is resistant to medical treatment from the acute to subacute stages, the most appropriate treatment for progressive infarction at these stages remains unclear. Here, we described a patient with VBI who underwent emergency superficial temporal artery-superior cerebellar artery (STA-SCA) bypass under partial mastoidectomy after confirming mismatch between diffusion-weighted imaging (DWI) findings and clinical symptoms. The patient showed a good outcome with this approach. To our knowledge, our surgical strategy has not been previously reported.Case DescriptionThe patient was a 71-year-old woman with progressive infarction because of atherothrombosis with bilateral VA occlusions resistant to maximum medical treatment. Emergency STA-SCA bypass under partial mastoidectomy was performed after confirming DWI findings and symptom mismatch. A good outcome was archived, and no additional cerebral infarctions were noted.ConclusionsEmergency bypass should be considered as a treatment option for VBI that is resistant to maximal medical treatment after confirming DWI findings and symptom mismatch. Our approach involving partial mastoidectomy provides a wide and shallow operative field for STA-SCA bypass, which allows accurate bypass with good outcomes.Copyright © 2018 Elsevier Inc. All rights reserved.

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