Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest . Heart size and cardiomediastinal contours are stable . Widespread severe pulmonary fibrosis is similar to prior with asymmetric right mid and upper lung and left lower lung opacities . Right lower lung opacity has increased since the prior exam . No substantial pleural effusion or pneumothorax .
    OUTPUT:
    
Increased right lower lung opacity with pre-existing right upper and left lower lung opacities , superimposed on background pulmonary fibrosis .