A temporary disc-like structure at the median atlanto-axial joint in human fetuses We found that a relatively lower or shorter dens accompanied a thicker and larger disk in the median atlanto-axial joint. Without compression from the dens, incomplete degeneration might occur. Currently there is no information on the association of the disk with anomalies of the craniocervical junction, such as Chiari malformations and neurocentral synchondrosis [8,9,10,11,12]. Therefore, further detailed examinations of the relationship between bone anomalies and the persistent disk-like structure would be warranted.
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