Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiograph demonstrates unremarkable mediastinal , hilar and cardiac contours . Both lungs are hyperexpanded with increased retrosternal space and flattening of the diaphragms . No evidence of interstitial lung disease or focal opacification , concerning for pneumonia . No pleural effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary process . Stable hyperexpanded lungs .