{
  "abstract": "Spinal extradural arachnoid cysts (SEDACs) are rare lesions thought to arise from a dural defect associated with a check-valve mechanism, although direct intraoperative evidence is limited. We report a 17-year-old female presenting with persistent low back pain and bilateral lower extremity numbness. Magnetic resonance imaging demonstrated a cystic lesion at the Th12–L1 level displacing the dural sac, while computed tomography myelography failed to identify a communicating tract. Surgical exploration was performed due to persistent symptoms and a suspected dynamic mechanism. Intraoperatively, a dural defect at the nerve root sleeve with nerve root incarceration was identified. Cerebrospinal fluid leakage ceased after closure of the defect, confirming a check-valve mechanism. The cyst was resected and the defect repaired. The patient’s symptoms resolved completely, with no recurrence at 2-year follow-up. This case provides direct intraoperative evidence of the proposed pathophysiology of SEDAC.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "case report",
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "name": "Takashi Dezawa"
    },
    {
      "name": "Katsunori Fukutake"
    },
    {
      "name": "Keiji Hasegawa"
    },
    {
      "name": "Daisuke Kamakura"
    },
    {
      "name": "Naobumi Tochigi"
    },
    {
      "name": "Hiroshi Takahashi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8frxk14gtjkx9.bib",
  "cited_by": 0,
  "doi": "10.1093/jscr/rjag1020",
  "fulltext_url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC13731188/",
  "id": "8frxk14gtjkx9",
  "issns": [
    "2042-8812"
  ],
  "landing_url": "https://doi.org/10.1093/jscr/rjag1020",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "heading",
      "AcademicSubjects/MED00910"
    ],
    [
      "heading",
      "Case Report"
    ],
    [
      "heading",
      "jscrep/0150"
    ],
    [
      "openalex",
      "2728|Neurosurgical Procedures and Complications"
    ]
  ],
  "openalex": "W7225245727",
  "pdf_url": "https://academic.oup.com/jscr/article-pdf/2026/11/rjag1020/72931793/rjag1020.pdf",
  "pmcid": "PMC13731188",
  "pmid": "42984808",
  "published": "2026-11-04",
  "publisher": "Oxford University Press",
  "ris": "https://research.draconitic.com/paper/8frxk14gtjkx9.ris",
  "sources": [
    {
      "first_seen": "2026-11-08T12:21:25Z",
      "native_id": "PMC13731188",
      "source": "pmc",
      "url": "https://doi.org/10.1093/jscr/rjag1020"
    }
  ],
  "subjects": [
    {
      "field": "medicine",
      "origin": "openalex:2728|Neurosurgical Procedures and Complications",
      "subfield": "neurology"
    }
  ],
  "title": "Intraoperative demonstration of a check-valve mechanism in a spinal extradural arachnoid cyst with nerve root incarceration",
  "title_text": "Intraoperative demonstration of a check-valve mechanism in a spinal extradural arachnoid cyst with nerve root incarceration",
  "type": "peer-reviewed",
  "updated_at": "2026-11-08T12:21:25Z",
  "url": "https://research.draconitic.com/paper/8frxk14gtjkx9",
  "venue": "Journal of Surgical Case Reports",
  "versions": []
}