Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Overlying EKG leads are present . A retrocardiac opacities consistent with hiatal hernia . The lungs are grossly clear without definite signs of pneumonia or edema . No large effusion or pneumothorax is seen . Scattered areas of atelectasis noted . Cardiomediastinal silhouette is within normal limits . Bony structures are intact .
    OUTPUT:
    
Retrocardiac opacity consistent with hiatal hernia . No acute intrathoracic process .