Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . The mediastinal and hilar contours are unchanged . The pulmonary vascularity is normal . Lungs remain hyperinflated with attenuation of the pulmonary vascular markings within the lung apices compatible with underlying emphysema . Streaky airspace opacities are noted in the lung bases , which appears progressed when compared to the prior study within the left lung base . No pleural effusion or pneumothorax identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Streaky airspace opacities within the lung bases , slightly worse in the left lung base when compared to the prior study . These could reflect areas of bibasilar atelectasis but infection particularly in the left lung base can not be excluded . Emphysema .