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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