Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is enlarged . Mediastinal contours are normal . There is no focal opacity , pleural effusion or pneumothorax . Mild interstitial prominence is noted which may indicate mild pulmonary edema . There is no free air beneath the right hemidiaphragm .
    OUTPUT:
    
Cardiomegaly . Minimal pulmonary edema is difficult to exclude .