Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are relatively well expanded and clear . There is no pleural effusion or pneumothorax . The heart is likely normal in size with tortuous aortic contour . Moderate hiatal hernia is also suggested .
    OUTPUT:
    
Retrocardiac opacity in expected location of moderate hiatal hernia . This could be further evaluated on PA and lateral views if no history of such . No acute intrathoracic process .