Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP portable chest radiograph was provided . Lung volumes are low , though there is no definite sign of pneumonia or CHF . The heart is top normal in size . The aorta is unfolded . No pneumothorax or pleural effusion . Mild left basilar atelectasis noted . Hardware at the left humeral neck again noted . A retrocardiac density is compatible with known hiatal hernia .
    OUTPUT:
    
No acute findings in the chest .