Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate worsening bibasilar opacities , particularly in the retrocardiac area . There is also a left - sided pleural effusion . The cardiac size is top normal . There is no evidence of pulmonary edema . There is no pneumothorax . Degenerative changes of the spine are again present . There is no intra-abdominal free air . Surgical clips are noted in the left upper quadrant .
    OUTPUT:
    
Worsening bibasilar opacities concerning for pneumonia .