Cite

Copy

Tap on and choose 'Add to Home Screen' to create a shortcut app

Tap on and choose 'Add to Home Screen/Install App' to create a shortcut app

Radiological Features of Achondroplasia

This page was last updated on May 9th, 2017

General Findings

  • Stenosis at the foramen magnum
  • Generalized spinal canal stenosis
  • Hydrocephalus

CT Scan

  • Foramen magnum stenotic: The rim of the foramen magnum is thick, resulting in a narrow foramen. The narrow foramen magnum means that the vertebral arteries are closer to the midline.
  • Midline keel: There is a thick midline keel extending up from the foramen magnum.

3D CT angiography of foramen magnum in a child with achondroplasia: The foramen magnum is narrow, there is a deep midline keel in the occipital bone, the rim of the foramen magnum is thickened, and the distance between the vertebral arteries is less than normal.

 

MRI in Achondroplasia

  • Loss of CSF space: The CSF spaces at the cervicomedullary junction are effaced.
  • T2-weighted changes in spinal cord: T2-weighted signal change is present in more than 50% of cases at the time of surgical decompression (17).
  • Instability rare: Cervical instability is rare in achondroplasia, either at presentation or as a result of decompression.

Sagittal T2-weighted MRI in a child with achondroplasia: There is stenosis at the foramen magnum with intramedullary signal change in the spinal cord. The rest of the spinal canal is also narrow, in keeping with achondroplasia.

 

 

 

Your donations keep us going

The ISPN Guide is free to use, but we rely on donations to fund our ongoing work and to maintain more than a thousand pages of information created to disseminate the most up-to-date knowledge in the field of paediatric neurosurgery.

By making a donation to The ISPN Guide you are also indirectly helping the many thousands of children around the world whose treatment depends on well-informed surgeons.

Please consider making a donation today.

Use the app

The ISPN Guide can be used as a standalone app, both on mobile devices and desktop computers. It’s quick and easy to use.

Fully featured

Free registration grants you full access to The Guide and host of featured designed to help further your own education.

Stay updated

The ISPN Guide continues to expand both in breadth and depth. Join our mailing list to stay up-to-date with our progress.