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Severe Traumatic Brain Injury due to Repeated Minor Head Injury while Snowboarding:A Report of Two Cases Sotaro OSHIDA 1 , Nobukazu KOMORIBAYASHI 1,2 , Shinichi OMAMA 1,2 , Tomohiko MASE 1,3 , Yoshihiro INOUE 2,4 , Kuniaki OGASAWARA 1 1Department of Neurosurgery, Iwate Medical University School of Medicine 2Iwate Prefectural Advanced Critical Care and Emergency Center, Iwate Medical University School of Medicine 3Division of Disaster Medicine, Department of Critical Care, Disaster and General Medicine, Iwate Medical University School of Medicine 4Division of Critical Care Medicine, Department of Critical Care, Disaster and General Medicine, Iwate Medical University School of Medicine Keyword: second impact syndrome , angular acceleration , axonal injury , acute subdural hematoma , snowboarding pp.521-526
Published Date 2020/6/10
DOI https://doi.org/10.11477/mf.1436204222
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 Second impact syndrome occurrs when a patient who has sustained an initial head injury, most often a concussion, sustains a second head injury before the symptoms associated with the first have fully resolved, leading to rapid brain swelling and herniation. However, the underlying pathophysiology remains unclear. We report two cases in which acute subdural hematoma with rapid malignant brain swelling developed after repeated head traumas while snowboarding. One patient did not undergo craniotomy and died 21h after symptom onset. The other underwent urgent decompressive craniotomy and experienced prolonged disturbance of consciousness. Axial susceptibility-weighted magnetic resonance imaging performed 1 month after surgery in the second patient revealed multiple microbleeds in the subcortical white matter and parasagittal white matter in the bilateral hemispheres. These findings indicate that axonal injuries from angular acceleration may contribute to the rapid malignant brain swelling and poor outcomes.


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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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