Os odontoideum

Case contributed by Yazane Abdallah

Presentation

Progressive walking difficulty. No history of trauma.

Patient Data

Age: 40 years
Gender: Female
mri
  • 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.

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