Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . Left - sided Port - A - Cath tip terminates in the SVC . The heart size is normal . The mediastinal and hilar contours are unchanged , with aortic knob calcifications present . Linear opacity within the left lung base most likely reflects atelectasis . However , more focal consolidative opacity in the retrocardiac region is nonspecific and could represent atelectasis or infection . Small left pleural effusion appears new compared to the prior exam . Right lung base also demonstrates mild atelectatic changes . No pneumothorax is demonstrated . Expansile lesion within the anterior right fifth rib is unchanged . Previously noted subacute fractures of the right inferior ribs are not clearly demonstrated on the current exam .
    OUTPUT:
    
1 . Bibasilar atelectasis with more focal consolidative opacity in the retrocardiac region , findings which could represent infection or atelectasis . 2 . New trace left pleural effusion .