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Basilar invagination

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Basilar invagination

(Science: radiology) dens projects into base of skull, McGregor's line greater than 4.5 mm, chamberlains line greater than 3 mm, may lead to obstructive hydrocephalus aetiology: primary anomalies of occiput, atlas, axis, softened bone: rickets / osteomalacia, pagets disease, fibrous dysplasia, dysostoses: OI, achondroplasia, cleidocranial dysostosis Cf: platybasia