Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: there bilateral lower lobe areas of increased opacity with small bilateral effusions . Some of this may represent chronic fibrosis given the patient 's history , but overall appearance is markedly improved compared to ___ . But the appearance is slightly worse compared to much earlier prior exam from ___ .
    OUTPUT:
    
Increased markings at both bases . It is unclear if this is acute or chronic .