Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided subclavian central line in situ with the lead tip in the distal SVC . Persistent opacification involving the left lower lobe . Mild elevation of the left hemidiaphragm . There is interval improvement of airspace opacification involving the left midlung zone . The right lung is clear . No significant effusion . No sinister bony lesions .
    OUTPUT:
    
Persistent opacification involving the retrocardiac left lower lobe . Mild interval improvement in the opacification projecting over the left mid lung zone . This preliminary report was reviewed with Dr . ___ , ___ radiologist .