Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No new focal consolidation is seen on the frontal view , however , on the lateral view , there may be patchy opacification in the retrocardiac region , involving 1 the lower lobes . . There is no large pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Possible retrocardiac patchy opacification involving one of the lower lobes , best seen on the lateral view , could be due to pneumonia in the appropriate clinical setting versus atelectasis / overlap of structures .