Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Overall , there is no change from yesterday 's PET - CT scan . Patient is known to have a large left hilar mass which encases the central bronchovascular care . There is a large left effusion which appear similar to PET - CT performed yesterday . Right lung remains clear . No shift of midline structures . No pneumothorax .
    OUTPUT:
    
Known left hilar mass with large left pleural effusion .