Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is minimal bilateral lower lung atelectasis . The lungs are otherwise clear . Moderate - to - severe cardiomegaly is increased compared to the prior study from ___ . The descending thoracic aorta is slightly tortuous . A C - shaped lucency in the retrocardiac region is seen on the lateral projection , consistent with a hiatal hernia . There are no pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
1 . No acute cardiac or pulmonary findings . 2 . Increased moderate - to - severe cardiomegaly . 3 . Hiatal hernia .