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CHORUS

Collaborative Hypertext of Radiology

Musculoskeletal system

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basilar invagination

  • dens projects into base of skull

    • McGregor's line > 4.5 mm
    • Chamberlain's line > 3 mm

  • may --> obstructive hydrocephalus

etiology:
  • 1' anomalies of occiput, atlas, axis
  • softened bone: rickets / osteomalacia, Paget's dz
  • fibrous dysplasia
  • dysostoses: OI, achondroplasia, cleidocranial dysostosis

Cf: platybasia

Charles E. Kahn, Jr., MD  -  2 February 1995
Last updated:  1 October 2013


 

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Copyright © 2013, Charles E. Kahn, Jr.