Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle left base opacity is felt to more likely represent atelectasis and consolidation . The right lung is clear . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable . The aorta is calcified . Coronary artery calcification / stenting is noted .
    OUTPUT:
    
No definite acute cardiopulmonary process . Subtle opacity at the left lung base may represent atelectasis .