Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . Aortic knob calcifications are again seen . Mediastinal contours are unchanged . Right PICC tip appears to terminate in the SVC . Assessment of the lung bases is limited due to underpenetration . There appears to be a retrocardiac opacity as seen on the prior study , likely reflective of atelectasis . Small bilateral pleural effusions , left greater than right are likely present . There is mild pulmonary vascular congestion but no overt pulmonary edema . No pneumothorax is identified .
    OUTPUT:
    
Limited exam . Persistent retrocardiac opacity , likely atelectasis , with probable small bilateral pleural effusions , left greater than right . Mild pulmonary vascular congestion .