Abstract
Foramen transversarium is formed by the vestigial costal element fused to the body and the true transverse process of the vertebra. Present study carried out on 60 cervical vertebrae that showing variations in the presentation of foramen transversarium. Among them, 25 vertebrae show double (accessory) foramen transversarium, 15 vertebrae having double bubble appearance (incomplete double foramen transversarium) and 20 vertebrae having asymmetrical foramen transversarium. The results of present study shows incidence of variations more common on right side as compare to left in which unilateral accessory foramen transversarium more common than bilateral, even incomplete double foramen transversarium and narrowing of foramen transversarium more common on right side. Conclusion from this study etiology of variation in foramen transversarium may be related with the variation in the course of vertebral artery due to development reason.
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