A case of fourth atlanto-axial facet joint: anatomical description
Xing-Wen Wang, Feng-Zeng Jian, Feng Ling
August 2015, Volume 25, Issue 1, pp 104 - 106 Case Report Read Full Article 10.1007/s00586-015-4184-7
First Online: 13 August 2015
Purpose
To report a rare fourth atlanto-axial joint.
Methods
A cadaveric specimen of a young male adult from occiput to C4 was dissected for anatomical study of craniocervical region. A true fourth atlanto-axial joint was confirmed. Its morphological characteristics were described.
Results
The fourth atlantoaxial joint is rarely seen. The possible embryogenesis is discussed. This case raises an anatomical possibility of a new variant in this region.
Conclusions
A unique case with an anatomically proven fourth atlantoaxial joint is reported. This anomaly can lead to misdiagnosis. CT scan coupled with MRI can facilitate accurate diagnosis.
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