Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy , CABG , and aortic valve replacement . Heart size remains mildly enlarged . Mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Small bilateral pleural effusions are present , increased in size on the left , and similar in size on the right . Patchy opacities in the lung bases likely reflect areas of compressive atelectasis . Previously demonstrated left apical pneumothorax appears resolved . There are no acute osseous abnormalities .
    OUTPUT:
    
Small bilateral pleural effusions , increased in size on the left , and unchanged on the right , with bibasilar atelectasis .