Abstract
Purpose
This study aimed to elucidate the severity of neurological deficits in a large series of patients with acute spontaneous spinal epidural haematoma (SSEH) using magnetic resonance imaging (MRI).
Methods
We included 57 patients treated for acute SSEH at 11 institutions and retrospectively analysed their demographic and MRI data upon admission. We investigated MRI findings, such as the haematoma length and canal occupation ratio (COR). The neurological severity of SSEH was assessed based on the American Spinal Injury Association score on admission.
Results
Of the 57 patients, 35 (61%) presented with severe paralysis. The MRI analysis showed that SSEH was often located in the cervical spine, dorsal to the spinal cord, and spread over more than three vertebrae. No differences in age, sex, and aetiology were found between patients with and without severe paralysis. The hypo-intensity layer encircling the haematoma, intra-haematoma heterogeneity, and increased CORs were observed more frequently in the severe paralysis group. Furthermore, pathological examination of a dissected haematoma from one patient with a hypo-intensity layer revealed a collagen layer around the haematoma, and patients with intra-haematoma heterogeneity were more likely to have a bleeding predisposition.
Conclusions
In this large series of patients with SSEH, we identified some MRI features associated with severe paralysis, such as the hypo-intensity layer, intra-haematoma heterogeneity, and increased COR. Accordingly, patients with these MRI characteristics should be considered for early surgical intervention.
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Data availability
The datasets during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Shintaro Honda, Takayoshi Shimizu, and Shunsuke Fujibayashi contributed to the study’s conception and design. Material preparation and data collection were performed by Shintaro Honda, Naoya Tsubouchi, Yusuke Kanba, Takashi Sono, Hiroaki Kimura, Seichi Odate, Eijiro Onishi, Yasuyuki Tamaki, Takuya Tomizawa, Ryosuke Tsutsumi, and Ko Yasura. The first draft of the manuscript was written by Shintaro Honda and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript. All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript.
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All procedures performed in this study were in accordance with the ethical standards of the institutional ethics committee of Kyoto University (IRB number R2901, March 18, 2021), and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Written informed consent to participate in this study was waived due to the retrospective observational nature of this study, and no identifiable information of the participants was included in the manuscript. Patients signed informed consent regarding publishing their data and photographs.
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Honda, S., Fujibayashi, S., Shimizu, T. et al. Neurological severity evaluation using magnetic resonance imaging in acute spontaneous spinal epidural haematomas. International Orthopaedics (SICOT) 46, 2347–2355 (2022). https://doi.org/10.1007/s00264-022-05513-y
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DOI: https://doi.org/10.1007/s00264-022-05513-y