Case 1-airspace vs. interstitial disease: fluffy and ill-defined vs linear/reticular and well-defined, lobar vs diffuse

Case 2-focal lung disease:  masses vs nodules based on shape, size greater or less than 3 cm

Case 3-cystic lung disease: analysis of wall thickness, shape to assist in differential diagnosis

Case 4-ground glass opacity:  radiodensities that are less dense than airspace, with vessels visible in involved areas on CT

Case 5-pleural disease: analysis of location, shape, lobularity, and recognition of dense material (effusion) vs air (pneumothorax)