Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two views were obtained of the chest . Interstitial abnormality is likely unchanged and probably relates to extensive paraseptal emphysema seen on the prior chest CT . There is no right pleural effusion with perhaps trace left pleural effusion . The heart is normal in size and normal mediastinal and hilar contours . No pneumothorax is seen .
    OUTPUT:
    
Perhaps trace left pleural effusion without acute intrathoracic process .