• Masaki Ujihara, Shun Suzuki, Masahito Kobayashi, Sachiko Hirata, Kazuhiko Takabatake, Toru Hatayama, and Takamitsu Fujimaki.
• Department of Neurosurgery, Saitama Medical University, Saitama, Japan. Electronic address: ujihara@saitama-med.ac.jp.
• World Neurosurg. 2024 Aug 1; 188: e53e58e53-e58.

ObjectiveHemifacial spasm (HFS) results from vascular compression at the root exit of the facial nerve. Although the underlying etiology has yet to be identified, it has been suggested that congenital vascular anomalies are involved. We have hypothesized common trunk anomaly of the anterior inferior cerebellar artery (AICA) and posterior inferior cerebellar artery (PICA) which may play a role in HFS. However, no previous studies have directly compared the incidence of this anomaly between HFS patients and normal subjects. The present study was designed to address this gap in the literature.MethodsThis case-control study compared magnetic resonance angiography data from 65 HFS patients and 65 normal subjects. Dominant AICA/PICA is defined as the absence of PICA/AICA, with the remaining AICA/PICA supplying both vascular territories. The term "common trunk" encompasses both dominant AICA and dominant PICA. The frequency of common trunk and dominant AICA/PICA was compared between the 2 groups.ResultsThere were no significant differences in the incidence of a common trunk (68.5% and 64.6%), dominant AICA (30.8% and 32.3%) and dominant PICA (37.7% and 32.3%) between the 2 groups. Additionally, no differences were found in the frequency of atherosclerosis risk factors.ConclusionsThere was no apparent association between common trunk anomaly and HFS. It is suspected that some vascular anomalies other than a common trunk are involved in HFS.Copyright © 2024 Elsevier Inc. All rights reserved.

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