Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low and there is crowding at both bases . On the lateral view , there is increased opacity projecting over the lower lobes posteriorly . It is unclear if this is all due to volume loss or if an infectious infiltrate is present . The heart size continues to be mildly enlarged . the mediastinal silhouette is unchanged compared to prior .
    OUTPUT:
    
Compared to prior study of ___ , the appearance of the lower lobes is worse and it is unclear if this is due to volume loss or new infiltrate .