Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low but improved compared to the prior study . There is mild elevation of the right hemidiaphragm . The degree of mediastinal widening has decreased significantly compared to the prior study , now at the upper limits of normal . No consolidation , pneumothorax or pleural effusion seen . The visualized bony structures are unremarkable in appearance .
    OUTPUT:
    
Low lung volumes . Otherwise , unremarkable chest radiographs .