Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable chest radiograph is obtained . The heart is top normal in size . There is no overt pulmonary edema or definite signs of pneumonia . No pneumothorax or pleural effusion . The mediastinal contour appears stable . Bony structures are intact .
    OUTPUT:
    
Mild stable cardiomegaly . No overt evidence of pneumonia or CHF .