Table 2.

All parameters are described in the supine and sitting positions. In the sitting position, the pineal body shifted ventrally and caudally, cerebellar tonsil descended, and the optic nerve sheath area, perimeter, and lateral ventricular volume decreased significantly.

Changes in intracranial structure between the supine and sitting positions n = 32 (16 males and 16 females)
Shift of the pineal body (mm)	In the ventral direction	P-value	Intra-observer agreements	Inter-observer agreements
	0.68 ± 0.27	< 0.001	0.965	0.959

Changes in intracranial structure between the supine and sitting positions n = 32 (16 males and 16 females)
Shift of the pineal body (mm)	In the caudal direction	P-value	Intra-observer agreements	Inter-observer agreements
	0.76 ± 0.24	< 0.001	0.966	0.958

Changes in intracranial structure between the supine and sitting positions n = 32 (16 males and 16 females)
	Supine	Sitting	P-value	Intra-observer agreements while supine/sitting	Inter-observer agreements while supine/sitting
Length of the pituitary stalk (mm)	4.29 ± 1.15	3.06 ± 1.07	< 0.001	0.941/0.860	0.821/0.849
Distance between the cerebellar tonsil and BO line (mm)	4.77 ± 3.79	2.67 ± 3.77	< 0.001	0.994/0.995	0.980/0.991
Right optic nerve sheath area (mm2)	26.20 ± 4.57	22.20 ± 4.17	< 0.001	0.950/0.945	0.912/0.931
Left optic nerve sheath area (mm2)	26.46 ± 5.78	22.30 ± 4.74	< 0.001	0.972/0.969	0.981/0.964
Right optic nerve sheath perimeter (mm)	17.15 ± 1.58	15.68 ± 1.48	< 0.001	0.948/0.941	0.940/0.935
Left optic nerve sheath perimeter (mm)	17.13 ± 1.83	15.71 ± 1.75	< 0.001	0.978/0.969	0.975/0.943
Lateral ventricular volume (ml)	16.54 ± 7.19	15.73 ± 6.97	< 0.001	0.980/0.977	0.971/0.987

BO line: basion-to-opthision line.