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Aplasia of the Posterior Arch of the Atlas : Case Report―Proposal for a New Clinical Classification Teruaki Izaki 1 1Department of Orthopaedic Surgery, Fukuoka University Chikushi Hospital Keyword: spine , 脊椎 , atlas , 環椎 , anomaly , 奇形 pp.379-383
Published Date 2004/3/1
DOI https://doi.org/10.11477/mf.1408100407
  • Abstract
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 Partial or complete aplasia of the posterior arch of the atlas is a rare anomaly. The purpose of this report is to describe the radiological findings in a case we encountered and to review the literature on congenital defects of the posterior arch of the atlas. A 20-year-old woman who had been found to have an abnormality of the posterior arch of the atlas was referred to our hospital for a further diagnostic work-up. She complained of nonspecific neck pain and headaches, but a neurological examination revealed normal findings. Roentgenograms and CT scans revealed absence of the posterior arch of the atlas except for the posterior tubercle. MR imaging showed no evidence of compression or signal changes in the cord at the C1-C2 level. The symptoms rapidly subsided in response to conservative treatment. Recent studies have shown that the bony gap in the posterior arch is bridged by loose connective tissue rather than cartilage, and thus the anomaly is thought to be attributable to defective cartilage development rather than a disorder of ossification per se.


Copyright © 2004, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1286 印刷版ISSN 0557-0433 医学書院

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