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Basilar invagination
Basilar invagination
is
invagination
(infolding) of the
base of the skull
that occurs when the top of the
C2 vertebra
migrates upward. It can cause narrowing of the
foramen magnum
(the opening in the skull where the
spinal cord
passes through to the
brain
). It also may press on the lower
brainstem
.
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