Ponticulus Posticus (Posterior Ponticle of the Atlas, Arcuate Foramen)
bony bridge in the first cervical vertebra between the lateral mass and the posterior arch
Forms an arcuate foramen
Posterior Arch Non-Union
A common anomaly of no clinical significance
Lack of a Spinolaminar Jct. Line on the lateral view (at any level from C1- C7)
May be difficult to see on the APOM, but look for a smoothly marginated sagittal midline
defect
Down syndrome
Agenesis of the Transverse Ligament is found in 20% of Down Syndrome patients
Causes instability (ADI above normal )
Ossiculum Terminale Persistens of Bergman
anomaly of the odontoid process in which an ossification center that gives rise to the tip of
the dens fails to fuse properly with the body of the axis
Os Odontoideum
- rare anomaly of the second cervical vertebrae
- characterised by a separation of a portion of the odontoid process (also called the dens)
from the body of the axis
- the little bone is marked by a small oval corticated ossicle of which the size can range
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