Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest compared to multiple previous exams including chest CTs dating back to ___ , most recent chest x-ray from ___ . The known lung mass is again seen in the superior segment of the left lower lobe . Trace right - sided pleural effusion is identified . Previously identified right basilar opacity has improved , potentially due to resolved infection or atelectasis . There is some linear opacity at the left lung base laterally , also potentially due to atelectasis . Vague opacities in the right mid lung can be atributed to healing posterior seventh and eighth rib fractures .
    OUTPUT:
    
Left lower lobe opacity again suspicious for malignancy . Trace right effusion . Bibasilar opacities , potentially due to atelectasis ; however , clinical correlation would be necessary to exclude infection .