Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes accentuate bronchovascular markings . Small bilateral effusions are not changed . Bibasilar opacities may represent atelectasis . Hilar and mediastinal silhouettes are unchanged . Mild - to - moderate cardiomegaly is unchanged . Perihilar vascular congestion and mild pulmonary edema persists .
    OUTPUT:
    
In comparison to ___ exam , there is no significant change in small bilateral pleural effusions , bibasilar atelectasis and mild pulmonary edema .