Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Changes of coronary artery bypass grafting are present , with median sternotomy wires and mediastinal clips . Heart size is normal . There is no evidence of pulmonary edema . No significant pleural effusions or pneumothorax . Well - circumscribed curvilinear density projects over the left hemithorax , of uncertain significance .
    OUTPUT:
    
No acute cardiopulmonary process . Nonspecific density over the left hemithorax can be evaluated by nonemergent 2 - view CXR .