Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph demonstrates a mildly enlarged heart and hyperinflated lungs . There is no focal consolidation , pleural effusion , or pneumothorax . There is mild peribronchial thickening . The visualized upper abdomen is unremarkable . There is no evidence of intraperitoneal free air .
    OUTPUT:
    
No evidence of intraperitoneal free air .