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Diagnosis of Fetal Microcephaly

Biparietal Diameter (mm)

SD below the Mean

Week
Mean
-1
-2
-3
-4
-5
20
48
45
42
40
37
34
21
51
48
46
43
40
37
22
54
52
49
46
43
41
23
57
55
52
49
46
44
24
61
58
55
52
49
47
25
64
61
58
55
53
50
26
67
64
61
58
56
53
27
69
67
64
61
58
56
28
72
70
67
64
61
59
29
75
72
69
67
64
61
30
78
75
72
69
67
64
31
80
77
74
72
69
66
32
82
79
77
74
71
68
33
84
81
79
76
73
70
34
86
83
80
78
75
72
35
87
85
82
79
76
74
36
89
86
83
80
78
75
37
90
87
84
82
79
76
38
91
88
85
83
80
77
39
92
89
86
83
81
78
40
92
89
87
84
81
78
41
93
90
87
85
82
79
42
93
91
88
85
82
80

Chervenak FA, Jeanty P, Cantraine F et al. The diagnosis of microcephaly. Am J Obstet Gynecol 149:512-517, 1984.

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Ultrasound Educational Press     Go Top
Peter W. Callen, M.D.
Professor of Radiology, Obstetrics, Gynecology and Reproductive Science
University of California Medical Center, San Francisco, California

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