Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright chest radiograph was provided . Lung volumes are low which limits evaluation as well as the presence of overlying EKG leads . Allowing for limitations , the lungs are clear . The heart remains mildly enlarged . No pneumothorax or effusion is seen . No overt edema or definite signs of pneumonia . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Mild cardiomegaly stable , no overt signs of edema or pneumonia .