Table 1:

Cross-sectional area measurements in the principal cerebral sinuses^a

Sinus	Cross-Sectional Area (mm2)
	Before LP		After LP
Right transverse	40 ± 21b	(4–76)	52 ± 22	(6–79)
Left transverse	45 ± 20b	(7.5–78)	52 ± 23	(8–78)
Superior sagittal	52 ± 21b	(17–88)	54 ± 21	(17–88)
Straight	23 ± 13b	(2–45)	30 ± 16	(4–48)

^aN = 4 patients. Data are reported as mean (range).

^bSignificant difference (P ≤ .05) between measurements before and after LP.