Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate unremarkable mediastinal and hilar contours . Stable mild cardiomegaly noted . Lungs are clear . No pleural effusion or pneumothorax evident .
    OUTPUT:
    
Stable mild cardiomegaly . No focal opacification . No overt pulmonary edema .