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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 21:1167-1171 (6 2000)
© 2000 American Society of Neuroradiology

ARTICLE

Partial Aplasia of the Posterior Arch of the Atlas with an Isolated Posterior Arch Remnant: Findings in Three Cases

Aseem Sharma^a, Shailesh B. Gaikwad^,a, Parminder S. Deol^a, Nalin K. Mishra^a and Shashank S. Kale^a

^a From the Departments of Neuroradiology (A.S., S.B.G., P.S.D., N.K.M.) and Neurosurgery (S.S.K.), Neurosciences Centre, All India Institute of Medical Sciences, New Delhi, India.

Summary: We report the imaging findings in three symptomatic cases of partial aplasia of the posterior arch of the atlas with an isolated posterior remnant of the arch. These cases are instructive in illustrating the mechanism of cord impingement produced by the posterior arch remnant during extension of the cervical spine. Additionally, focal increased T2 signal was observed within the cord at the level of the anomaly in two of the patients.

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