Which of the following is NOT listed as a congenital abnormality contributing to cervical spondylolisthesis?

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The idea is that cervical spondylolisthesis can be influenced by developmental abnormalities that alter the stability of the spine. Spina bifida occulta is a birth defect of the neural arch, which can weaken the posterior elements. A hypoplastic pedicle means the pedicle is underdeveloped, reducing the bony support that helps keep vertebrae aligned. A brachial plexus anomaly is another congenital variation that can accompany cervical development and contribute to abnormal alignment or instability. An atlas fracture, however, is a traumatic break of the first cervical vertebra, not a congenital defect. Because it arises from acute injury rather than present from birth, it isn’t considered a congenital abnormality contributing to cervical spondylolisthesis.