• Qianquan Ma, Chao Wu, Jia Zhang, Xiaoliang Yin, Chenlong Yang, Yu Si, Haibo Wu, Qiang Zhao, Ying Liu, Huishu Yuan, Qing Chang, Jingcheng Xie, Jun Yang, and Jianjun Sun.
• Department of Neurosurgery, Peking University Third Hospital, Peking University, Beijing, China.
• World Neurosurg. 2022 Jul 1; 163: e106-e112.

BackgroundSacral cysts are classically divided into Tarlov cysts and meningeal diverticula. However, the pathogenesis of sacral cysts remains unclear. This study aimed to clarify a novel type of sacral extradural spinal meningeal cyst with a specific arachnoidal structure.MethodsNine patients with prophylactic diverticula were included in the study. All patients underwent MRI preoperative reconstruction and traditional neck transfixation.ResultsAll patients presented with more than one symptom. The major symptom was lower extremity pain, followed by lower extremity numbness (77.8%, 7/9), lower extremity weakness (55.6%, 5/9), bowel/bladder and sexual dysfunction (55.6%, 5/9), and tenesmus (22.2%, 2/9). After long-term follow-up, the outcome was classified as improved in 9 patients (100%).ConclusionsThe clinical findings of this study illustrate a special subtype and may help explain the mechanism of sacral cyst formation.Copyright © 2022 The Authors. Published by Elsevier Inc. All rights reserved.

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