The diagnostic feature of congenital diaphragmatic hernia on prenatal ultrasonography is -
A cyst behind the left atrium
Mediastinal shift with normal hea axis
Peristalsis in the thoracic cavity
Absence of gas bubble under the diaphragm
Ans. is 'c' ie. Peristalsis in the thoracic cavity " The sonographic diagnosis of fetal CDH relies on the visualisation of abdominal organs in the chest. Other pointers may be absence of a normally positioned stomach, mediastinal displacement, small abdominal circumference and polyhydramnois."