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FIGURE 112.34 Graphic illustrations of a normal cervical spinal cord and specific postinjury
syndromes. A: Brown-Séquard syndrome. B: Central cord syndrome. C: Anterior artery
syndrome. D: Complete transection.

The os odontoideum is an abnormality that may be the result of an occult
flexion injury with subsequent incomplete healing and bone resorption ( Fig.
112.35 ). It may also represent an overgrowth of the ossiculum terminale, often