Incidence of Congenital Posterior Arch Defects of the Atlas in Chinese Population.

Objective: To study the incidence of congenital posterior arch defects of the atlas and in combination with other congenital variations in the Chinese population.

Methods: We retrospectively reviewed 1405 images of cervical 3-dimensional computed tomography (3D CT) and 1284 images of head and cervical 3-dimensional computed tomography angiography (3D CTA), including images of 1539 male and 1150 female individuals. These images of cervical 3D CT and head and cervical 3D CTA were obtained in the Department of Radiology of 2 hospitals, Second and Third People's Hospital of Jingzhou, China, from January 2020 to October 2023.

Arterial Vascular Structures Running Through Retrotransverse Foramen and Retrotransverse Groove of the Atlas Vertebrae.

Objective: Retrotransverse foramen (RTF) and retrotransverse groove (RTG) are anatomic variations of the atlas (C1) vertebrae. RTF contains an anastomotic vein connecting atlanto-occipital and atlanto-axodian venous sinuses. The purpose of this study was to analyze the arterial vascular structures running though the RTF and RTG.

Retrotransverse Foramen and Retrotransverse Groove Anatomic Variations of the Atlas Vertebra in the Chinese Population.

Objective: To analyze the prevalence of retrotransverse foramen (RTF) or retrotransverse groove (RTG) anatomic variations in Chinese atlas vertebra (C1).

Methods: Three-dimensional volume-rendered computed tomography angiography images of 427 subjects (264 males, 163 females; 17-87 years old) were reviewed and evaluated using dedicated software. The prevalence of RTF and RTG anatomic variation of C1 was analyzed.