Congenital fusion of cervical vertebrae is a rare anomaly, occurring when two or more cervical vertebrae are congenitally fused. This anomaly goes by several names: cervical vertebral fusion syndrome (CVFS), Klippel-Feil syndrome (KFS), congenital dystrophia brevicollis, and Klippel-Feil deformity. I consider congenital fusion of cervical vertebrae (CFCV) a better descriptive term, but the literature and most of the research articles refer to Klippel-Feil Syndrome, so to avoid confusion, I will, too. 

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