Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior chest radiograph , all lines and tubes have been removed . The bilateral lung aeration has improved dramatically . There is a small left pleural effusion . There is a subtle right basilar opacity . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pneumothorax is seen .
    OUTPUT:
    
1 . Small left pleural effusion . 2 . Subtle right basilar opacity , which could represent residual pneumonia .