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 …

PURPOSE To describe our experience with congenital anomalies of the posterior arch of the
atlas, with a review and classification of these defects and a note on their clinical …

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 …

Study Design. A case report of a patient with a congenital anomaly of the posterior arch of
the atlas and review of the literature are reported. Objective. To describe a unique …

OBJECTIVE AND IMPORTANCE: Congenital anomalies of the posterior arch of the atlas
(C1) are uncommon. They range from partial clefts to total agenesis of the posterior arch …

PURPOSE: To illustrate the radiological findings and review the current literature concerning
a rare congenital abnormality of the posterior arch of the atlas. CASE REPORT: An adult …

Isolated anomalies of the posterior portion of the atlas are more common than is generally
realized. Recognition of this anomaly is essential in order to distinguish it from clinically …

We describe CT and MRI of a previously unreported combination of atlantoaxial anomalies
consisting of posterior arch hypoplasia in a bipartite atlas with an os odontoideum, in a 30 …

Discussion Ossification of the posterior arch of the atlas usually proceeds
penichondnally[31] from two centers located in the lateral masses. The posterior half-arches …

CT Recognition of Anomalies of the Posterior Arch of the Atlas Vertebra: Differentiation from
Fracture Page 1 176 \ , . . " . . . . . .' ~. . ' ~ ~ ~. CT Recognition of Anomalies of the Posterior Arch …