CASE 102 History: The patient is a 6-year-old child with Down syndrome. 1. What should be included in the differential diagnosis? (Choose all that apply.) e. Persistent ossiculum terminale 2. All of the following are odontoid anomalies occurring in childhood and adolescence except: a. Aplasia b. Hypoplasia 3. What does the horizontal dark line within C2 on sagittal MRI represent? a. Hahn cleft d. Inferior cortical margins of C2, which is fused with C3 4. Which of the following features does not favor congenital os odontoideum over an old odontoid fracture with nonunion?
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