Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low which accentuates bronchovascular markings . A known large hiatal hernia , projecting is a rounded opacity behind the cardiac silhouette is re - demonstrated . Mild cardiomegaly is unchanged . No pleural effusions . No pneumonia or pulmonary edema .
    OUTPUT:
    
Low lung volumes with no evidence of acute cardiopulmonary process .