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.

Also known as: Bull-Nixon syndrome, basilar impression, primary, primary basilar impression

35 clinical trials for this condition and its sub-types.