TY - JOUR T1 - Partial Aplasia of the Posterior Arch of the Atlas with an Isolated Posterior Arch Remnant: Findings in Three Cases JF - American Journal of Neuroradiology JO - Am. J. Neuroradiol. SP - 1167 LP - 1171 VL - 21 IS - 6 AU - Aseem Sharma AU - Shailesh B. Gaikwad AU - Parminder S. Deol AU - Nalin K. Mishra AU - Shashank S. Kale Y1 - 2000/06/01 UR - http://www.ajnr.org/content/21/6/1167.abstract N2 - 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. ER -