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Figure 11b. Rapid progression of cervical spine overgrowth. (a) Right lateral radiograph obtained in a patient at age 6 years shows enlargement but relatively normal alignment of the cervical vertebral bodies. (b) Right lateral radiograph obtained at age 8
years shows progressive enlargement of the vertebral bodies with resultant fixed hyperextension of the upper cervical spine and hyperflexion of the lower cervical spine, which led to a reduction in the patients mobility.