The prevalence of congenital C1 arch anomalies

Hyun, Gina; Allam, Emad; Sander, Paul Samuel; Hasiak, Christopher; Zhou, Yihua

doi:10.1007/s00586-017-5283-4

Cited by 17 publications

(24 citation statements)

References 18 publications

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“…To the best of our knowledge, this is the first study to report the prevalence of congenital arch anomalies of C1 through the CT examinations of the cervical spine in Omani population. In the existing literature, the reported prevalence of C1 arch anomalies varied between 0.95% and 5.65% [1,[9][10][11][12][13]. In a study by Geipel [9], congenital C1 defects were found in 4% of 1,613 adult specimens.…”

Section: Discussionmentioning

confidence: 99%

“…In the present study, type A posterior arch anomaly was found to be the most common, followed by type B posterior arch anomaly, other types of posterior arch anomalies were not detected. The reported prevalence of various types of posterior arch anomalies were described in Table 2 [1,[9][10][11][12][13]. In all these studies, type A was the most common.…”

Section: Discussionmentioning

confidence: 99%

“…reported defects in 3.8% of 1,069 cases from Switzerland. A recent study by Hyun et al [ 13 ], have noted congenital C1 arch anomalies of 5.65% among 3,273 subjects from United States. Evidence from these studies suggests that prevalence of C1 anomalies is more common in Caucasians when compared to Asians [ 10 - 13 ].…”

Section: Discussionmentioning

confidence: 99%

“…A recent study by Hyun et al [ 13 ], have noted congenital C1 arch anomalies of 5.65% among 3,273 subjects from United States. Evidence from these studies suggests that prevalence of C1 anomalies is more common in Caucasians when compared to Asians [ 10 - 13 ]. In the present study, the reported prevalence of C1 arch anomalies was 4.37%.…”

Section: Discussionmentioning

confidence: 99%

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Radiologic evaluation of congenital anomalies of anterior and posterior arch of atlas in Omani subjects

et al. 2021

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The atlas (C1) is known to show congenital anomalies in its anterior and posterior arches. Though posterior arch anomalies are well known, the anterior arch anomalies are seldom reported in the literature [1]. Currarino et al. [1] have classified posterior arch anomalies into five types: Type A, failure of fusion of two hemi arches; Type B, defect in one side of the arch, Type C, defects on both sides of arch, Type D, absence of arch except posterior tubercle, and Type E, absence of whole arch including tubercle. Type A is the frequent type and it occurs in 5.4% of the population and 97% of all posterior arch defects. When compared to posterior arch, the occurrence of anterior arch anomalies is rare [2]. So far only few cases of anterior arch of C1 including either absence or clefts have been reported [3].Anomalies of C1 may cause atlantoaxial joint instability which necessitates the treatment with a cervical collar or surgery. Furthermore, these anomalies may increase the

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Radiologic evaluation of congenital anomalies of anterior and posterior arch of atlas in Omani subjects

et al. 2021

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“…In a retrospective study of a large number of patients who underwent CT scan of the cervical spine for various reasons, approximately 1.5 to 5% of the patients had posterior arch of atlas defects, whereas approximately 0.46% had a combination of both anterior and posterior defects and the prevalence of an isolated anterior arch of atlas defect was 0.03% [8]. We extrapolate the true incidence of isolated anterior arch of atlas defects in the population to be rarer than this.…”

Section: Discussionmentioning

confidence: 99%

Rare and Unique Case of Midline Anterior Arch of Atlas Non-formation Mimicking Jefferson Type 1 Fracture

Das

Palaniandy

Bakar

et al. 2020

Cureus

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Cervical spine injuries are rare occurrences in children, especially the congenital anomalies of the atlas vertebra. Any injury involving the craniovertebral junction such as Jefferson fracture, is a valid cause for alarm due to the complex nature of the craniovertebral junction and the morbidity associated with it. We report the case of a 10-year-old male, who had failure of fusion of anterior arch of atlas due to the failure of formation of the anterior midline synchondrosis, and this mimicked a Jefferson fracture. If it was not for the peculiar absence of any corresponding evidence to suggest spinal injury, we might have mistaken this extremely rare but benign anomaly for a Jefferson fracture and subjected the patient to needless surgical treatment. Hence, it is concluded that keen clinical acumen and clear understanding of the developmental anatomy of these patients may be necessary to adequately manage them.

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