Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a left basilar opacity likely due to a combination of moderate pleural effusion and underlying atelectasis . Blunting of the lateral and posterior costophrenic angles on the right suggests small effusion . These changes have increased since prior exam . Pulmonary vascular congestion is again noted . The cardiomediastinal silhouette is stable . Mitral annular calcifications are again noted . Left chest wall dual lead pacing device is again noted . No acute osseous abnormalities .
    OUTPUT:
    
Moderate left pleural effusion with underlying atelectasis noting infection would also be possible . Pulmonary vascular congestion and probable small right pleural effusion as well .