Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Evaluation is slightly limited due to patient 's positioning . Within this limitation , the patient is status post median sternotomy and coronary artery bypass graft surgery . The cardiac silhouette remains moderately enlarged but unchanged . The mediastinal contours are prominent , which is related in part to unfolding of the thoracic aorta and patient 's positioning with slight rotation to the right . The hilar contours appear unchanged . The right hemidiaphragm remains elevated compared to the left . The inspiratory lung volumes remain low . Streaky opacification of the right lung base is increased , which may represent worsening atelectasis . Mild opacification of the left lung base most likely reflects atelectasis . A small right pleural effusion is present . The left costophrenic angle is clear . No pneumothorax is detected .
    OUTPUT:
    
Worsened right basilar opacification with elevated right hemidiaphragm , likely a combination of pleural fluid and atelectasis .