Lack of relationship between the existence of down beat nystagmus and the height of the axial process in Basilar impression

Abstract

Basilar impression can be diagnosed according to the measurement of the height of the axial process seen on the X-ray. Down beat nystagmus is considered to be a characteristic finding in basilar impression, however, such is not apparent in all cases. In our 4 cases, the relationship between the existence of down beat nystagmus and the height of the axial process had no apparent relationship.