Fusion of the Sixth and Seventh Cervical Vertebra: A Case Report

Abstract

Aim: To report a rare fusion of the 6th and 7th cervical vertebra in a cadaver specimen.
 Presentation of Case: A fused C6-C7 vertebra was discovered during maceration in the Anatomy laboratory in a South-Eastern Nigerian University. The laminas were completely fused while their bodies, transverse processes and spinous processes were fused partially.
 Discussion: Block vertebra is the fusion of one or more adjoining vertebrae in which they act as one, both structurally and functionally. These fusions, although present in other regions, is more common in the cervical region. Among the reported cases, there is a higher incidence of fusion between C2-C3 with only few reported cases of fusion between C6-C7. Fused cervical vertebra impact biochemical and mechanical stress on the adjoining vertebra which results in various neurological and physical problems, hence the report could create an insight that could aid researchers and medical diagnoses. 
 Conclusion: This unusual fusion of C6-C7 vertebra reported provides basis of anatomical variations in which proper documentation of incidence and knowledge will be beneficial to anatomists, orthopaedic surgeons, radiologists and other medical personnel.