atlanto-occipital assimilation

Atlanto-occipital
assimilation • Bilateral atlanto-occipital assimilation - Ganzer Fall bei Radiopaedia
Knipe H, Bilateral atlanto-occipital assimilation. Case study, Radiopaedia.org (Accessed on 03 Mar 2023) https://doi.org/10.53347/rID-28350 • CC by-nc-sa 3.0 (modified)
Atlantookzipitale
und atlantoaxiale Fusion mit am ehesten anlagebedingter Verblockung zwischen dem Hinterhaupt, dem ersten und dem zweiten Halswirbel. Computertomografie axial, sagittal und koronar.
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Atlanto-occipital assimilation is the fusion of the atlas (C1) to the occiput and is one of the transitional vertebrae.

Epidemiology

Atlanto-occipital assimilation occurs in approximately 0.5% (range 0.08-3%) of the population . It is thought to affect males and females equally.

Clinical presentation

It is typically asymptomatic but symptoms from nerve or vascular compression can occur.

Gross anatomy

Fusion of C1 to the occiput can be either :

  • complete: C1 not identifiable
  • incomplete: C1 partially identifiable

It can also be classified as

  • posterior arch assimilation
  • anterior arch assimilation or
  • assimilation of both the anterior and posterior arches
Associations

Atlanto-occipital assimilation is associated with :

Siehe auch:
Assoziationen und Differentialdiagnosen zu atlantookzipitale Fusion:
Klippel-Feil-Syndrom
 
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Anomalien des
kraniozervikalen Übergangs
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Processus
paracondylicus
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Spondylodese
Atlas - Axis
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Processus
epitransversarius
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