Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Severe cardiomegaly is noted with mild pulmonary edema . There may be a component of underlying interstitial pulmonary fibrosis . No large effusion is seen . There is a retrocardiac opacity containing gas most likely a large hiatal hernia . No pneumothorax or large effusion is seen . Bony structures are intact .
    OUTPUT:
    
Severe cardiomegaly with mild edema . Probable pulmonary fibrosis . Large hiatal hernia .