Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Retrocardiac opacity again noted containing an air - fluid level is consistent with a hiatal hernia . There is mild hilar congestion without frank pulmonary edema . No large effusion or pneumothorax . No convincing signs of pneumonia or aspiration . Heart size remains mildly enlarged . The mediastinal contour is normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Cardiomegaly unchanged with mild pulmonary congestion , new from prior . Stable hiatal hernia .