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SPINE IMAGE
Year : 2017  |  Volume : 4  |  Issue : 1  |  Page : 38-39

Dystopic Os odontoideum: A rare cause of atlantoaxial instability


1 Fellow, Department of Neurosurgery, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala, India
2 Additional Professor, Department of Neurosurgery, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala, India
3 Professor, Department of Neurosurgery, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala, India

Correspondence Address:
Joe M Das
Fellow, Department of Neurosurgery, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.5005/jp-journals-10039-1124

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Os odontoideum is a relatively common developmental anomaly of the craniovertebral junction (CVJ), which is usually an incidental finding on spine imaging. But the dystopic variety of os odontoideum is uncommon and can be baleful. This anomaly can be a cause of atlantoaxial instability requiring surgical fixation. But the diagnosis of this variety requires considerable knowledge of anatomy of the CVJ as this unfamiliar entity needs to be differentiated from other CVJ anomalies like persistent os terminale, accessory ossicle of anterior arch of atlas, assimilation of atlas, and, most importantly, from orthotopic variety of os odontoideum. Here, we present a 34-year-old lady who presented with gradual-onset weakness of right side of the body. A computed tomography scan of the cervical spine revealed dystopic os odontoideum.


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