Assessment of basilar invagination

Case contributed by Prashant Mudgal
Diagnosis not applicable
Diagram

Frontal Image

  • Digastric line - tip of odontoid process is normally located 11 mm below this line.
  • Bimastoid line - tip of odontoid process projects normally not more than 10 mm above this line.

Lateral Image

  • McRae line - tip of odontoid process normally projects below this line
  • Chamberlain line - tip of odontoid process projects normally not more than 3 mm above this line.
  • McGregor line - tip of odontoid process projects normally not more than 5 mm above this line.

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