PT - JOURNAL ARTICLE AU - Sharma, Aseem AU - Gaikwad, Shailesh B. AU - Deol, Parminder S. AU - Mishra, Nalin K. AU - Kale, Shashank S. TI - Partial Aplasia of the Posterior Arch of the Atlas with an Isolated Posterior Arch Remnant: Findings in Three Cases DP - 2000 Jun 01 TA - American Journal of Neuroradiology PG - 1167--1171 VI - 21 IP - 6 4099 - http://www.ajnr.org/content/21/6/1167.short 4100 - http://www.ajnr.org/content/21/6/1167.full SO - Am. J. Neuroradiol.2000 Jun 01; 21 AB - 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.