Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is rotated . The patient is status post median sternotomy . The cardiac silhouette is top - normal to mildly enlarged . Mediastinal contours are unremarkable . Left base opacity may be due to overlying soft tissue although a small pleural effusion with atelectasis or consolidation is not entirely excluded .
    OUTPUT:
    
Low lung volumes and rotated patient . Lateral left basilar opacity may relate to low lung volumes however , underlying pleural effusion with atelectasis or consolidation is not excluded .