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

Table 1

Average measurements of recorded distances, comparing normal with grades of IH.

Variable	Normal	All IH	Grade 1	Grade 2	Grade 3
Distance from mammillary body tip to incisura line	3.39	−0.98	2.26	0	−3.80
Distance from the diaphragm sella to the optic chiasm		2.07	3.53	1.8
Angle of the optic chiasm	7.42 (3.93)	−4.95 (10.2)	−0.68 (7.63)	−1.19 (5.41)	−9.71
Height of the interpeduncular cistern at the plane of the cecum	12.76				10.39
Mammillopontine distance	7.07	4.47	5.32	4.6	3.79
Ratio of interpeduncular cistern	0.56	0.40	0.46	0.40	0.36
Distance from iter to tuberculum-venous confluence line	0.20	−2.51	−0.62	−	−4.67
Distance from splenium of the corpus callosum to the incisura line	0.99	−0.73	0.52	0.06	−2.01
Distance from caudal pole of tonsils to plane of the foramen magnum	1.98	−2.20	−	−	−1.71
Distance from obex to plane of foramen magnum	8.36	5.30	4.98	5.27	5.52

All measurements without are in mm with standard deviations provided in (). demarks measurements in degrees.