Transient tachypnea of the newborn; three different infants.
A. This 8-hour-old infant with moderate tachypnea has mild hyperinflation and subtle prominence of peribronchial markings. The heart is in the upper limits of normal in size. B. This markedly tachypneic 12-hour-old infant has severe hyperinflation, diffuse interstitial opacities, and a small, right pleural effusion. Dilated lymphatics contribute to the perihilar opacities. C. There is no substantial hyperinflation in this 2-hour-old infant. Faint alveolar opacification accompanies prominent peribronchial markings and indistinct pulmonary vessels. There is a trace of fluid in the minor fissure.