Introduction The craniovertebral junction (CVJ) comprises the occiput, atlas, and axis.
Radiographic evaluation of this region involves knowledge of only a few anatomical …

There are numerous congenital anomalies of the cervical spine. They can be simple and
clinically inconsequential to complex with serious neurologic and structural implications …

Object In this study the authors investigated the anatomical, clinical, and imaging features as
well as incidence of congenital defects of the C-1 arch. Methods The records of 1104 …

Introduction Head and neck skeletal anomalies or normal variants might predict the
occurrence of palatally displaced impacted maxillary canines. Despite their clinical …

Objective We sought to examine anatomic variations of the atlas and the clinical significance
of these variations. Methods We retrospectively reviewed 1029 cervical 3-dimensional (3D) …

Congenital hypoplasia of the posterior arch of the atlas (C1), a developmental failure of
chondrogenesis, is a rare anomaly and may range from partial clefts to total agenesis of the …

This study consists of a retrospective cohort study, a systematic review, and a meta-analysis
which were separately conducted. This study aimed to investigate the prevalence of atlas …

Objective Atlantal arch defects are rare. Few cadaveric and imaging studies have been
reported on the variations of such anomalies. Our goal in this study was to examine the …

BACKGROUND CONTEXT The retrotransverse foramen (RTF), arcuate foramen (AF),
unclosed transverse foramen (UTF) and posterior atlas arch defects (PAAD) are anatomic …

We present here the first cases in Neandertals of congenital clefts of the arch of the atlas.
Two atlases from El Sidrón, northern Spain, present respectively a defect of the posterior …