Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison the prior study , lung volumes remain low and there is linear bibasilar atelectasis . Heterogeneous opacification of the retrocardiac region has slightly worsened since the prior radiograph . Additionally , right - sided effusion is slightly larger . Heart size is stable . Right chest wall catheter appears to terminate over the deep right atrium , however this may appear falsely low secondary to the low inspiratory level .
    OUTPUT:
    
Since the prior radiograph , increase in opacification of the left lung base could reflect worsening atelectasis or infectious pneumonia . Apparent slight increase in right pleural effusion and adjacent basilar opacification .