primary basilar invagination
Primary basilar impression (PBI) is a very rare skeletal developmental defect characterized by congenital upward translocation of the upper cervical spine and clivus into the foramen magnum. PBI can be asymptomatic or associated with severe neurological dysfunction.
MONDO:0005172
skeletal system disorder
is_a
MONDO:0021147
disorder of development or morphogenesis
is_a
Bull-Nixon syndrome
exact
primary basilar impression
related