Skull Base and Cervical Spine Involvement in Jansen Syndrome: Case Report.

Introduction: Metaphyseal chondrodysplasia, Jansen type (JMD), is a rare form of endochondral ossification resulting in short limbs and dwarfism.

Case Report: A child presented with JMD and was found to have involvement of the cervical spine. Conservative treatment was given to the patient who at the long-term follow-up continues to have no neurological findings or cervical spine instability.

Conclusions: To our knowledge, this case represents the first report of involvement of the superior cervical spine in a patient with JMD. Clinicians should be aware of this potential albeit rare finding.