Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest . Low lung volumes are seen on the current exam with secondary crowding of the bronchovascular markings . Retrocardiac opacity may be due to atelectasis . Left chest wall single - lead pacing device is again noted . The cardiac silhouette appears enlarged but likely accentuated by low lung volumes . Fiducial marker seen in the left mid lung laterally with mild associated opacity which is better seen on prior chest CT . Known pulmonary nodules are better seen on prior CT .
    OUTPUT:
    
No definite acute cardiopulmonary process based on low lung volumes . No overt pulmonary edema . Known left lung opacity and pulmonary nodules are better seen on prior chest CT .