Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are ill - defined opacity at the bilateral lung bases which was not present on the prior examination . The remainder of the lungs are clear . The hilar and cardiomediastinal contours are normal . There is no large pleural effusion or pneumothorax . The pulmonary vascular markings appear normal . A right PICC line terminates at the cavoatrial junction and incidental note is made of several old right rib fractures .
    OUTPUT:
    
Bilateral lung base opacity concerning for pneumonia .