Diagnostic ultrasound ( PDFDrive )

CHAPTER 36 The Fetal Chest 1247
TABLE 36.2 Normal Thoracic Circumference Correlated With Gestational Age
PREDICTIVE PERCENTILES
Age (Wk) 2.5 5 10 25 50 75 90 95 97.5
16 5.9 6.4 7.0 8.0 9.1 10.3 11.3 11.9 12.4
17 6.8 7.3 7.9 8.9 10.1 11.2 12.2 12.8 13.3
18 7.7 8.2 8.8 9.8 11.0 12.1 13.1 13.7 14.2
19 8.6 9.1 9.7 10.7 11.9 13.0 14.0 14.6 15.1
20 9.5 10.0 10.6 11.7 12.9 13.9 15.0 15.5 16.0
21 10.4 11.0 11.6 12.6 13.7 14.8 15.8 16.4 16.9
22 11.3 11.9 12.5 13.5 14.6 15.7 16.7 17.3 17.8
23 12.2 12.8 13.4 14.4 15.5 16.6 17.6 18.2 18.8
24 13.2 13.7 14.3 15.3 16.4 17.5 18.5 19.1 19.7
25 14.1 14.6 15.2 16.2 17.3 18.4 19.4 20.0 20.6
26 15.0 15.5 16.1 17.1 18.2 19.3 20.3 21.0 21.5
27 15.9 16.4 17.0 18.0 19.1 20.2 21.3 21.9 22.4
28 16.8 17.3 17.9 18.9 20.0 21.2 22.2 22.8 23.3
29 17.7 18.2 18.8 19.8 21.0 22.1 23.1 23.7 24.2
30 18.6 19.1 19.7 20.7 21.9 23.0 24.0 24.6 25.1
31 19.5 20.0 20.6 21.6 22.8 23.9 24.9 25.5 26.0
32 20.4 20.9 21.5 22.6 23.7 24.8 25.8 26.4 26.9
33 21.3 21.8 22.5 23.5 24.6 25.7 26.7 27.3 27.8
34 22.2 22.8 23.4 24.4 25.5 26.6 27.6 28.2 28.7
35 23.1 23.7 24.3 25.3 26.4 27.5 28.5 29.1 29.6
36 24.0 24.6 25.2 26.2 27.3 28.4 29.4 30.0 30.6
37 24.9 25.5 26.1 27.1 28.2 29.3 30.3 30.9 31.5
38 25.9 26.4 27.0 28.0 29.1 30.2 31.2 31.9 32.4
39 26.8 27.3 27.9 28.9 30.0 31.1 32.2 32.8 33.3
40 27.7 28.2 28.8 29.8 30.9 32.1 33.1 33.7 34.2
With permission from Chitkara U, Rosenberg J, Chevanak FA, et al. Prenatal sonographic assessment of thorax: normal values. Am J Obstet
Gynecol. 1987;156(5):1069-1074. 30
A
B
FIG. 36.3 Unilateral Pulmonary Hypoplasia. (A) Axial sonogram of the fetal chest at 33 weeks’ gestation demonstrates mediastinal shift to
the left (arrow). No lung mass is present. (B) Axial MRI of the chest conirms the mediastinal shift and lack of a lung mass.