Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since most recent prior radiograph , there is increased opacity at the left base which is concerning for infection . Lung volumes are low . There is no pleural effusion or pneumothorax . Moderate cardiomegaly is stable . The monitoring and support devices are unchanged . Left chest tube is unchanged . Again seen is extensive subcutaneous air in the left soft tissues .
    OUTPUT:
    
Increased opacity at left base worrisome for infection . These findings were reported to Dr . ___ by Dr . ___ ___ telephone at 1 : 45 pm .