Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable upright frontal chest radiograph demonstrates mildly hypoinflated lungs . No pleural effusion or pneumothorax . Persistent mild cardiomegaly . Mediastinal contour and hila are otherwise unremarkable . No free air under the diaphragm .
    OUTPUT:
    
No evidence of free intraperitoneal air . If serious concern need dedicated upright radiograph or CT for further evaluation .