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Table 1: Distribution of numbers of fetuses providing data as a function of the indication for neurosonography
Indication No. Mean Gestational Week Min Max Median
CMV seroconversion 35 33.63 30 40 33
Ventricular asymmetry 54 31.78 21 37 32
Abnormal head circumference 15 34.27 29 38 35
Abnormal posterior fossa 10 31.60 26 35 32
Cystic lesions 8 33.75 31 37 33
Family history of CNS illness 6 32.33 31 34 32
Midline abnormalities 6 31.67 23 37 32
Obstetric complications and extra-CNS anatomic findings 28 31.00 23 36 32
Note:—Min indicates minimum; Max, maximum; CMV, cytomegalovirus.

Indication	No.	Mean Gestational Week	Min	Max	Median
CMV seroconversion	35	33.63	30	40	33
Ventricular asymmetry	54	31.78	21	37	32
Abnormal head circumference	15	34.27	29	38	35
Abnormal posterior fossa	10	31.60	26	35	32
Cystic lesions	8	33.75	31	37	33
Family history of CNS illness	6	32.33	31	34	32
Midline abnormalities	6	31.67	23	37	32
Obstetric complications and extra-CNS anatomic findings	28	31.00	23	36	32