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Basilar Invagination (Short Neck)
Basilar Invagination (aka Basilar Impression) is a craniocervical junction abnormality wherein the tip of the odontoid process projects superior to the foramen magnum and it manifests with a short neck on physical exam. It's seen in Chiari malformation, most commonly, and also in more rare skeletal anomalies, including:
- Achondroplasia
- Klippel-Feil syndrome
- Osteogenesis imperfecta
- Cleidocranial dysostosis