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

Table 4

Measurements of the percentiles 5, 10, 50, 90, and 95 of the antero-posterior diameter of the fetal cisterna magna (mm) obtained by three-dimensional ultrasonography.

	GA	n	Mean	SD	Min	Max	5th	10th	50th	90th	95th
Cisterna magna 3DUS	18	10	5.72	0.58	4.98	6.85	4.98	4.99	5.63	6.41	6.63
	19	10	5.47	0.81	4.22	6.60	4.32	4.43	5.45	6.29	6.44
	20	8	5.95	0.68	4.89	7.09	5.06	5.23	6.01	6.67	6.88
	21	10	7.62	1.50	4.19	9.20	4.96	5.74	7.95	9.01	9.11
	22	11	7.11	1.80	4.40	10.95	4.70	4.91	7.83	9.01	9.11
	23	10	7.34	1.22	5.22	9.38	5.69	6.16	7.39	8.67	9.02
	24	10	6.97	1.21	5.03	8.71	5.32	5.62	7.00	8.37	8.54
	Total	69	6.62	1.41	4.19	10.95	4.63	4.99	6.36	8.35	8.88

GA: gestational age; n: number of patients in each gestational age; SD: standard deviation; 3DUS: three-dimensional ultrasonography.