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Emerg Radiol. 2005 Jun;11(4):223-5.

Atlantoaxial instability associated with an orthotopic os odontoideum: a multimodality imaging assessment.

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  • 1Brigham and Women's Hospital, 75 Francis Street, Boston, MA, 02115, USA.

Abstract

Radiography, computed tomography (CT), and magnetic resonance imaging exams of the cervical spine were performed in a 29-year-old man who was ultimately diagnosed with an orthotopic os odontoideum during admission for injuries sustained in a motor vehicle collision. Initial radiography suggested either os odontoideum or an acute fracture of the dens. Further imaging with CT and flexion and extension radiographs confirmed os odontoideum and excluded a dens fracture. Although rare, os odontoideum is an important cervical spine anomaly to consider and to distinguish from an acute fracture of the dens.

PMID:
16133608
[PubMed - indexed for MEDLINE]
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