Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest . Right subclavian central venous catheter and left subclavian central venous catheter are in unchanged position with the left terminating in the mid SVC and the right terminating in the lower SVC . Linear atelectasis in the left lower lobe and scarring at the right base are unchanged . No pleural effusion or pneumothorax . Normal heart size , mediastinal and hilar contours . The previous interstitial abnormality has generally cleared with persisitent abnormality in the left mid lung . Given background abnormality it is difficult to say what is acute or infectious , but a small possibly viral infection is possible .
    OUTPUT:
    
Possible small infection , such as viral pneumonia in left mid lung on background of chronic interstitial abnormality . Change from preliminary to final report posted to ED dashboard at 11 : 20 on ___ and page sent to Dr ___ by Dr ___ .