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ABSENT POSTERIOR ARCH OF THE ATLAS

WENDE W. LOGAN M.D.1 and IAN DONALD STUARD M.D.2

1 Assistant Professor of Radiology.
2 Assistant Professor of Pathology.

Four examples of an absent posterior arch of the atlas are described.

Most patients with this anomaly have a small ossification posteriorly.

An abnormal location of the chondrification center, with subsequent hypoplastic cartilaginous development of the arch is postulated as the likely cause.

When this is an isolated anomaly, it is usually unassociated with neurologic abnormalities.


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 Am. J. Neuroradiol.Home page
A. Sharma, S. B. Gaikwad, P. S. Deol, N. K. Mishra, and S. S. Kale
Partial Aplasia of the Posterior Arch of the Atlas with an Isolated Posterior Arch Remnant: Findings in Three Cases
AJNR Am. J. Neuroradiol., June 1, 2000; 21(6): 1167 - 1171.
[Abstract] [Full Text]


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