====== Basilar impression ======

[[Basilar impression]] occurs when parts of the cervical (neck) vertebrae enter the hole in the skull base (foramen magnum).

[[Basilar invagination]] is the same problem, except that it’s caused by softening in the bones at the skull base.

[[Cranial settling]] occurs when the bone at the top of the neck on which the skull rotates (dens) extends into the foramen magnum.

see [[Basilar invagination]]