Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low and respiratory motion limits the evaluation . Faint left retrocardiac opacity is also seen on the lateral view projecting over the spine . Heart size is exaggerated by low lung volumes and is likely top normal . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Low lung volumes and respiratory motion limit the evaluation . 2 . Faint left retrocardiac opacity could reflect vascular crowding and atelectasis given low lung volumes . However , in the proper clinical setting pneumonia can not be excluded .