Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are unchanged compared to the prior study . Small right pleural effusion is stable . There is a slight worsening of the opacity projecting over the left base with complete silhouetting out of the left hemidiaphragm reflecting atelectasis in the left lower lobe , consolidation is not excluded . Mild pulmonary interstitial edema is unchanged . No pneumothorax .
    OUTPUT:
    
Increased opacification of the left lower lobe is consistent with worsening atelectasis ; however , in the appropriate clinical context , pneumonia is possible .