Os odontoideum

Case contributed by Yazane Abdallah


Progressive walking difficulty. No history of trauma.

Patient Data

Age: 40 years
Gender: Female
  • a well-corticated ossicle superior to the dense and posterior to the anterior arch of C1
  • increased atlantodental interval

  • compression of the spinal cord at the level of atlantoaxial joint, with high signal intensity on T2W images in the spinal cord at the same level

Case Discussion

Os odontoideum which is dystopic and causes atlantoaxial subluxation and narrowing of the spinal canal with subsequent myelopathy.

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.