Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no consolidation , pleural effusion , or pneumothorax . Lungs are mildly hyperinflated . Heart size is top - normal . Mediastinal and hilar and pleural surfaces are unremarkable .
    OUTPUT:
    
No pneumonia or pulmonary edema . Heart size top - normal . Mild pulmonary hyperinflation could be due to small airway obstruction or emphysema .