- Respiratory Distress Syndrome (RDS) is a clinical diagnosis but one which is often interchanged with the terms Hyaline Membrane Disease (a pathological diagnosis) and Surfactant Deficiency (a term describing the typical appearances on radiographs of infants with RDS).

- The typical radiological features of Surfactant Deficiency are:

1-Small volume lungs

2-Homogenous "ground glass" opacity

3-Air bronchograms

-The differential diagnosis includes:

1-Pneumonia (particularly Group B Streptococcus)

2-Retained Fetal Lung Fluid/TTN

http://www.adhb.govt.nz/newborn/TeachingResources/Radiology/LungParenchyma.htm