Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Retrocardiac opacity with associated volume loss may reflect atelectasis . No large effusion or pneumothorax . No signs of congestion or edema . Cardiomediastinal silhouette appears normal . Bony structures are intact .
    OUTPUT:
    
Left lower lobe volume loss with associated streaky opacity most likely representing atelectasis . Please note a superimposed subtle pneumonia is impossible to exclude .