An Objective Study of Anatomic Shifts in Intracranial Hypotension Using Four Anatomic Planes

Table 3

Suggested cutoff distances for the proposed grades.

Variable	Suggested cutoff values
Distance from mammillary body tip to incisura line
Distance from the diaphragm sella to the optic chiasm
Angle of the optic chiasm	1.7
Height of the interpeduncular cistern at the plane of the cecum
Mammillopontine distance
Ratio of interpeduncular cistern
Distance from iter to tuberculum-venous confluence line	−1.15
Distance from splenium of the corpus callosum to the incisura line
Distance from caudal pole of tonsils to plane of the foramen magnum	−0.1
Distance from obex to plane of foramen magnum

All suggested values are in mm except for those denoted by which are in degrees.