Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains mildly enlarged . The aorta is tortuous , unchanged . Mediastinal and hilar contours are otherwise stable . The pulmonary vasculature is normal . Patchy opacities in the lung bases are minimally worse compared to the prior exam , and likely reflect areas of atelectasis though infection is difficult to exclude in the correct clinical setting . No pleural effusion or pneumothorax is identified . Scoliosis of the thoracolumbar spine with multilevel degenerative changes are again demonstrated .
    OUTPUT:
    
Patchy bibasilar opacities , slightly worse in the interval , could reflect areas of atelectasis but infection is not completely excluded .