Newborn term infant with respiratory distress

CXR of congenital lobar emphysema
CXR on day 1 (above) shows a semi-solid mass in the right middle lobe obscuring the right heart border. CXR on day 5 (below) shows the right middle lobe mass has now cleared of fluid and has filled with air and is causing mediastinal shift to the left.

The diagnosis was congenital lobar emphysema of the right middle lobe.