Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chronic interstitial reticular opacities are similar to multiple prior studies with new superimposed airspace opacities likely representing pneumonia in bilateral lung bases , particularly in the retrocardiac area . There is likely a left pleural effusion as well . There is no pneumothorax or definite pulmonary edema or right pleural effusion . A left pectoral pacemaker projects in unchanged location with interval addition of a second coronary sinus lead . The cardiomediastinal silhouette is otherwise unchanged , partially silhouetted by diffuse parenchymal abnormalities .
    OUTPUT:
    
Chronic interstitial process with superimposed airspace opacities likely representing pneumonia .