Congenital pulmonary airway malformation type I, has large cystic areas, which may have air-fluid levels. Also, these large cysts may produce mass effect and mediastinal shift, which may be confused with congenital diaphragmatic hernia on a radiograph. Cross-sectional imaging helps in this regard.

(Case courtesy: Dr. Abhijit Yadav, Dr. B L Yadav center for diagnostic imaging and research).