Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest was obtained . The heart size , which is mildly enlarged , is slightly increased compared to the prior exam , likely related to inspiratory effort . The heart size and cardiomediastinal contours are normal . The lungs are clear . No focal consolidation , pleural effusion , or pneumothorax . Dilated loop of bowel is again seen in the left upper quadrant . Left - sided central catheter terminates in the lower SVC . No free abdominal air is identified .
    OUTPUT:
    
Mild cardiomegaly . No free abdominal air identified .