Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and aortic valve replacement . Heart size remains mildly enlarged . Hilar and mediastinal contours are normal . Previously demonstrated tiny right apical pneumothorax is not appreciated on the current exam . Patchy opacity in the left lung base appears slightly worse in the interval , with continued small bilateral pleural effusions . No pulmonary vascular congestion is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy retrocardiac opacity appears slightly worse in the interval , suggestive of worsening atelectasis , though infection is not excluded . Small bilateral pleural effusions , not substantially changed . Previously noted tiny right apical pneumothorax appears resolved .