Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable chest radiograph demonstrates clear lungs . No pleural effusion or pneumothorax evident . A central line is in place with the tip within the atrium . The mediastinal contour and aortic endograft are stable . The hilar contours are stable . No overt pulmonary edema is seen .
    OUTPUT:
    
No focal opacification concerning for pneumonia .