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BASILAR INVAGINATION LINES
BASILAR INVAGINATION
? INFOLDING OF THE BASE OF SKULL THAT
OCCURS WHEN THE TOP OF C2 VERTEBRA
MIGRATES UPWARD
CHAMBERLAIN LINE
? POSTERIOR END OF HARD PALATE TO
MIDPOINT OF POSTERIOR PART OF FORAMEN
MAGNUM (OPISTHION)
? IF STRUCTURE ABOVE >3MM PRESENT ¨C IT
INDICATES BASILAR INVAGINATON
Basilar invagination lines
? IF OPISTHION NOT SEEN ¨C MCGREGAR LINE
? IT EXTENDS FROM THE POSTERIOR PART OF
HARD PALATE TO MOST CAUDAL POINT ON
FORAMEN MAGNUM
Basilar invagination lines
DIGASTRIC LINE(basilar invagination+ ,
if ATLANTO-OCC. JOINT PROJECTS AT
OR ABOVE THIS LINE)
BIMASTOID LINE(basilar invagination +
if odontoid process >10mm above this
line)
MC RAE LINE
? LINE FROM BASION TO OPISTHION
? NORMALLY, TIP OF DENS IS 5 MM BELOW
THIS LINE
? IF PRESENT ABOVE THE LINE, BASILAR
INVAGINATION

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Basilar invagination lines