Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart not enlarged . There is slight unfolding of the aorta . Within limits of plain film radiography , no hilar or mediastinal lymphadenopathy is detected . No CHF , focal infiltrate , effusion , or pneumothorax is detected . There is minimal atelectasis at the right lung base .
    OUTPUT:
    
No acute pulmonary process identified . No radiographic evidence of pneumonia .