Comparison of Fetal Cerebellum and Cisterna Magna Length by 2D and 3D Ultrasonography between 18 and 24 Weeks of Pregnancy

Table 2

Comparison of different measures and the antero-posterior diameter of the fetal cisterna magna (mm) obtained by two- and three-dimensional ultrasound.

Cisterna magna	n	Min	Max	Mean	SD	10th	25th	50th	75th	90th
2DUS	69	3.18	9.32	5.60	1.33	4.01	4.70	5.43	6.44	7.28
3DUS	69	4.19	10.95	6.62	1.41	4.99	5.61	6.36	7.77	8.43
3DUS-2DUS	69	−1.27	3.84	1.02	0.83	0.00	0.52	1.05	1.53	1.93

2DUS: two-dimensional ultrasonography; 3DUS: three-dimensional ultrasonography; SD: standard deviation; n: number of case in each gestational age.