Incidence and Variants of Posterior Arch Defects of the Atlas Vertebra

Author:

Guenkel Sebastian1ORCID,Schlaepfer Sladjana1,Gordic Sonja2,Wanner Guido A.1,Simmen Hans-Peter1ORCID,Werner Clément M. L.1ORCID

Affiliation:

1. University Hospital Zurich, Division of Trauma Surgery, 8091 Zurich, Switzerland

2. University Hospital Zurich, Department of Radiology, 8091 Zurich, Switzerland

Abstract

In order to describe the incidence and existing variants of congenital anomalies of the atlas vertebrae in a Caucasian population, we examined 1069 CT scans of the upper cervical spine. We found 41 cases with altered atlas vertebrae, representing 3.8% of all analyzed patients. With 83% of all found anomalies, the predominant type is characterized by a small dorsal cleft (3.2% of all patients). Rare varieties feature unilateral or bilateral dorsal arch defects, combined anterior and posterior clefts (0.2% of all patients) or total erratic atlas vertebra malformation (0.1% of all patients). Atlas arch defects are found nearly 4% at the time. Most anomalies affect the posterior arch, whereas the anterior arch or both are rarely affected. Totally irregular C1 vertebrae are extremely infrequent.

Publisher

Hindawi Limited

Subject

Radiology, Nuclear Medicine and imaging,Radiological and Ultrasound Technology

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