Atlantoaxial instability associated with an orthotopic os odontoideum: a multimodality imaging assessment |
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Authors: | Tomas M. Vargas Frank J. Rybicki Stephen M. Ledbetter John D. MacKenzie |
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Affiliation: | (1) Brigham and Womens Hospital, 75 Francis Street, Boston, MA, 02115, USA |
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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. |
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Keywords: | Os odontoideum Odontoid process Dens Cervical spine anomaly Cervical spine trauma |
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