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Journal of Craniovertebral Junction and Spine
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Year : 2014  |  Volume : 5  |  Issue : 4  |  Page : 176-178

Complete absence of the posterior arch of C1: Case report

1 Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
2 Department of Neurological Surgery, Washington University, St. Louis, Missouri, USA

Correspondence Address:
N S Dahdaleh
Department of Neurologic Surgery, Northwestern University, 676 N. St. Clair, Suite 2210, Chicago, Illinois - 60611
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0974-8237.147090

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Posterior atlas arch anomalies are relatively common, but have a variety of presentations ranging from partial clefts to complete agenesis of the posterior arch. Partial clefts are prevalent in 4% of patients and are generally asymptomatic. However, complete agenesis of the posterior arch is extremely rare. We report the case of a 46-year-old man who presented with upper cervical spine and occipital pain as well as left sided headaches. Imaging revealed congenital complete absence of the posterior arch of C1 (Type E) without any radiographic evidence of instability. We discuss our case in light of other reported cases and detail its management.

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