Set 1: interstitial vs alveolar

63 year old male with shortness of breath, history of several myocardial infarctions in the past

Once again, we have an INTERSTITIAL pattern.  In this case, there are also tiny dots, or ‘nodules’, so we can call this a ‘reticulo-nodular pattern’.  Once again, the abnormal opacities are relatively well-defined.  They overlay the normal pulmonary vasculature and partly obscure the vessel margins, making them harder to see.