Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP view of the chest . Low lung volumes again seen . Interstitial opacities appear more conspicuous on the current exam which could be due to component of lower lung volumes and technique however superimposed component of interstitial edema is suspected . There is no confluent consolidation . The cardiac silhouette appears slightly enlarged compared to prior but some of this is may be due to lordotic positioning . Median sternotomy wires and mediastinal clips are again noted .
    OUTPUT:
    
Suspected component of interstitial edema superimposed on chronic interstitial process . Cardiomegaly which has progressed since prior although some of this may be positional .