Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are small to moderate pleural effusions bilaterally with opacities at the lung bases suggesting minor atelectasis . Effusions are somewhat smaller than on the prior radiographs on each side . On the right , there is again some tracking of effusion along the major fissure . Elsewhere , the lung fields remain essentially clear . The cardiac , mediastinal and hilar contours appear unchanged .
    OUTPUT:
    
Small to moderate bilateral pleural effusions with basilar opacities probably attributable to atelectasis , somewhat smaller than on the prior study .