Figure 1. (A) Prenatal ultrasound image of left congenital diaphragmatic hernia with intrathoracic stomach and liver herniation on axial view. (B) Lung area obtained by trace method for determination of the lung-to-head ratio. (C) Head circumference, which is measured in the standard biparietal view. These measurements are typically acquired at 24–32 weeks’ gestation.^{32 61 62}.