Fig. 7
Images in a 26-year-old woman referred for suspected prenatal CHAOS.
a Sagittal US image demonstrates expanded, echogenic lungs (
asterisk) and a flattened hemidiaphragm. Fetal ascites is also visible (
arrow).
b Sagittal SSFSE T2-W MRI at 24 weeks’ gestation demonstrates an expanded left lung and resultant flattening of the hemidiaphragm (
arrowheads). Intraperitoneal ascites is visible (
A). Mild dilation of the left lower lobe bronchus (
arrow) is also visible.
c Coronal SSFSE T2-W MRI demonstrates narrowing of the intrathoracic trachea between the dominant right aortic arch (
black arrow) and the smaller left aortic arch (
white arrow).
White asterisk demarcates the right lung.
d Axial image from fetal echocardiogram demonstrates left aortic arch (
LAA) and right aortic arch (RAA), confirming the presence of a double aortic arch resulting in upper airway obstruction "(Images reprinted with permission [
2])