title: Short Segment Stabilization by Protecting the Alar Ligaments in a Case of Eosinophilic Granuloma Involving the C2 Spine.
abstract: BACKGROUND
  The craniocervical junction is a complex anatomic location that contains the occipital bone, atlas, axis, and important complex ligamentous structures. The stability of this region is ensured only with the help of ligaments.
  
  
  METHODS
  A 6-year-old boy was admitted to our clinic for neck pain. Computed tomography and magnetic resonance imaging revealed a lytic bone lesion involving the C2 vertebral body and pedicle without odontoid tip. The tumor was resected using an anterior retropharyngeal approach and a wide marginal resection method. The odontoid tip and alar ligaments were protected, and the costal autografts were located between the C1-odontoid tip and the C3 body. The costal graft was stabilized in the C3 body with a miniplate. Then, C1-C3 posterior fixation with fusion was performed. The craniocervical junction was not considered unstable because the occipital bone was not involved in the fusion. Histologic examination confirmed the diagnosis of eosinophilic granuloma. Fusion was detected on a 1-year postoperative cervical computed tomography scan.
  
  
  CONCLUSIONS
  The occiput should not be involved in the fusion area when the alar ligaments are preserved during surgery for a C2 lesion.
authors.affiliation: Department of Neurosurgery, Farabi Hospital, Konya, Turkey. Electronic address: mkilik@gmail.com.
authors.forename: Mustafa Kemal
authors.initials: MK
authors.lastname: Ilik
authors.affiliation: Department of Neurosurgery, Erciyes University Faculty of Medicine, Kayseri, Turkey.
authors.forename: Abdülfettah
authors.initials: A
authors.lastname: Tumturk
authors.affiliation: Department of Neurosurgery, Erciyes University Faculty of Medicine, Kayseri, Turkey.
authors.forename: Halil
authors.initials: H
authors.lastname: Ulutabanca
authors.affiliation: Department of Neurosurgery, Erciyes University Faculty of Medicine, Kayseri, Turkey.
authors.forename: Ahmet
authors.initials: A
authors.lastname: Kücük
authors.affiliation: Department of Neurosurgery, Erciyes University Faculty of Medicine, Kayseri, Turkey.
authors.forename: Rahmi Kemal
authors.initials: RK
authors.lastname: Koc
mesh_terms: D002574:Cervical Vertebrae / Q000000981:diagnostic imaging / Q000601:surgery*; D002648:Child; D019299:Decompression, Surgical / Q000379:methods*; D004803:Eosinophilic Granuloma / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D007593:Joint Instability / Q000601:surgery*; D008022:Ligaments / Q000473:pathology*; D008279:Magnetic Resonance Imaging; D008297:Male; D013123:Spinal Fusion / Q000379:methods*; D014057:Tomography, X-Ray Computed
keywords: Alar ligament; Axis; Eosinophilic granuloma; Marginal resection