Anomalies and Normal Variations of the Dens
There always has been some disagreement about whether the os terminale and the os odontoideum are the same or different bones. However, I have always considered them to be the same, believing that the os terminale becomes the os odontoideum when it enlarges in association with hypoplasia of the dens (1). This also has been suggested by others (2), and the concept is depicted in Fig. 4.1.
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- 2.von Torklus D, Gehle W. The Upper Cervical Spine: Regional Morphology, Pathology, and Traumatology; An X-Ray Atlas. New York: Grune & Stratton, 1972.Google Scholar
- 5.Ricciardi JE, Kaufer H, Louis DS. Acquired os odontoideum following acute ligament injury: Report of a case. J Bone Joint Surg Am 58a:410–412, 1976.Google Scholar
- 6.Gwinn JL, Smith JL. Acquired and congenital absence of the odontoid process. AJR 88:424–431, 1962.Google Scholar