Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A Port - A - Cath terminates at cavoatrial junction . The patient is status post sternotomy and coronary artery bypass graft surgery . The cardiac , mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . There is new patchy opacity in the right lower lobe , probably compatible with atelectasis ; elsewhere lungs remain clear .
    OUTPUT:
    
No pleural effusions identified . Minor right base opacity , probably atelectasis .