Radiographs of a patient with clinical findings of cervical myelopathy demonstrate spinolaminar line disruption C1-C2 with anterior displacement of C1 on flexion, hypertrophic anterior tubercle of C1, and normal atlantodental interval. What is the most likely diagnosis?

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Quizplus · Accepted Answer

The described radiographic findings are indicative of os odontoidium, which is characterized by a separate ossicle at the apex of the odontoid process with smooth, well-corticated margins, suggesting a non-traumatic etiology. The normal atlantodental interval excludes transverse ligament laxity and acute dens fracture, and there's no specific mention of features directly associating these findings with Down syndrome.

Radiographs of a Patient with Clinical Findings of Cervical Myelopathy