Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single frontal upright view of the chest was obtained portably . Lung volumes are slightly low resulting in bronchovascular crowding . Increased opacity at the left lung base may represent infection . There is no pleural effusion or pneumothorax . Heart size is normal . Mediastinal silhouette and hilar contours are normal . Free air under the right hemidiaphragm is likely related to peritoneal dialysis .
    OUTPUT:
    
Increased opacity at the left lung base may represent pneumonia . If clinically indicated , PA and lateral views may be helpful for further evaluation . Finding of intraperitoneal air discovered at 6 : 30 am and discussed with Dr . ___ by phone at 6 : 30 am ___ .