{
  "abstract": "Background\n\nChiari malformation type I is commonly treated with posterior fossa decompression and C1 posterior arch resection to restore cerebrospinal fluid flow at the craniocervical junction. Although open microsurgical decompression remains the standard approach, minimally invasive techniques may reduce soft-tissue disruption and postoperative morbidity. Biportal endoscopy may provide adequate visualization and instrument maneuverability at the craniocervical junction.Methods\n\nA 60-year-old female presented with a 2-year history of progressive Valsalva-induced occipital headache and bilateral upper-limb paresthesias. Magnetic resonance imaging demonstrated a 5.7 mm descent of the cerebellar tonsils without syringomyelia. The patient underwent biportal endoscopic suboccipital decompression and partial C1 posterior arch resection using a 30° endoscope, high-speed burrs, Kerrison rongeurs, radiofrequency, and continuous saline irrigation. No dural opening or duraplasty was performed.Results\n\nThe operative time was 135 min, with minimal blood loss and no intraoperative complications. Postoperative CT confirmed adequate osseous decompression, including a 21 × 22 mm suboccipital craniectomy and a 10 mm C1 posterior arch resection. Postoperatively, the patient improved clinically without complications and was discharged on postoperative day 2.Conclusion\n\nBiportal endoscopic foramen magnum decompression with C1 posterior arch resection appears feasible in selected adult patients with Chiari malformation type I.",
  "abstract_shown": true,
  "affiliations": [
    "Department of Neurosurgery, Hospital de Especialidades, Centro Médico Nacional de Occidente, Guadalajara, Mexico.",
    "Department of Orthopedics and Traumatology, Hospital de Especialidades, Centro Médico Nacional de Occidente, Guadalajara, Mexico.",
    "Department of Neurosurgery, Hospital Regional de León, Institute for Social Security and Services for State Workers, Guanajuato, Mexico.",
    "Department of Neurosurgery, Hospital San José, Celaya, Mexico."
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Héctor Alonso Tirado-Ornelas"
    },
    {
      "affs": [
        1
      ],
      "name": "Silvia Loretto Tirado-Ornelas"
    },
    {
      "affs": [
        2
      ],
      "name": "Alejandro Esparza-Guinea"
    },
    {
      "affs": [
        0
      ],
      "name": "Yessenia Argentina RojasPérez"
    },
    {
      "affs": [
        0
      ],
      "name": "Jassiel Rosario Gastelum-Moreno"
    },
    {
      "affs": [
        3
      ],
      "name": "Rodolfo Guerrero-Pérez"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1dbp9y5cb4a9w.bib",
  "cited_by": 0,
  "doi": "10.25259/sni_877_2026",
  "fulltext_url": "https://europepmc.org/articles/PMC13726849",
  "id": "1dbp9y5cb4a9w",
  "issns": [
    "2229-5097",
    "2152-7806"
  ],
  "landing_url": "https://europepmc.org/article/MED/42974253",
  "language": "eng",
  "licence": "CC-BY-NC-SA",
  "licence_label": "CC BY-NC-SA",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by-nc-sa/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "heading",
      "Technical Notes"
    ],
    [
      "openalex",
      "2739|Spinal Dysraphism and Malformations"
    ]
  ],
  "openalex": "W7215056729",
  "pdf_url": "https://europepmc.org/articles/PMC13726849?pdf=render",
  "pmcid": "PMC13726849",
  "pmid": "42974253",
  "published": "2026-10-02",
  "publisher": "Scientific Scholar",
  "ris": "https://research.draconitic.com/paper/1dbp9y5cb4a9w.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T15:20:49Z",
      "native_id": "MED:42974253",
      "source": "europepmc",
      "url": "https://europepmc.org/article/MED/42974253"
    },
    {
      "first_seen": "2026-11-05T12:23:05Z",
      "native_id": "PMC13726849",
      "source": "pmc",
      "url": "https://doi.org/10.25259/sni_877_2026"
    }
  ],
  "subjects": [
    {
      "field": "medicine",
      "origin": "openalex:2739|Spinal Dysraphism and Malformations",
      "subfield": "epidemiology-public-health"
    }
  ],
  "title": "Biportal endoscopic foramen magnum decompression and C1 posterior arch resection for Chiari malformation type I: Technical note.",
  "title_text": "Biportal endoscopic foramen magnum decompression and C1 posterior arch resection for Chiari malformation type I: Technical note.",
  "type": "peer-reviewed",
  "updated_at": "2026-11-06T12:22:41Z",
  "url": "https://research.draconitic.com/paper/1dbp9y5cb4a9w",
  "venue": "Surgical neurology international",
  "versions": []
}