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Chapter 77 

Chapter 77
Chapter:
Chapter 77
Author(s):

Brandon C. Perry

and Kathleen R. Fink

DOI:
10.1093/med/9780199393947.003.0077
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date: 23 October 2020

An os odontoideum is a smooth, well-corticated ossicle located superiorly to a hypoplastic odontoid process. An orthotopic os odontoideum is located in the expected anatomic position posterior to the anterior arch of C1 with a gap between C2 and the os odontoideum. A dystopic os odontoideum is located elsewhere, often near the foramen magnum. Current evidence suggests that os odontoideum results from trauma during childhood, before the age of 5–6 years, although the etiology remains controversial. A hypertrophied and rounded anterior arch of C1 is a common associated finding.

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