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Congenital absence of the posterior arch of the atlas: a benign anomaly?
  1. M A Waheed1,
  2. P Gilligan2
  1. 1Department of Emergency Medicine, Beaumont Hospital, Dublin, Ireland
  2. 2Beaumont Hospital, Dublin, Ireland
  1. Correspondence toMir Abdul Waheed, Department of Emergency Medicine, Beaumont Hospital, Beaumont Road, Dublin 9, Ireland; Mirwaheed28{at}

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A 22-year-old woman presented after a road traffic accident. Cervical spine x rays showed congenital absence of the posterior arch of the atlas. Posterior arch aplasia can be complete or partial and is a rare condition. …

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  • Competing interests None.

  • Patient consent Obtained.

  • Ethics approval This study was conducted with the approval of the ethics committee of the Beaumont Hospital, Dublin.

  • Provenance and peer review Not commissioned; not externally peer reviewed