Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Minimal left base atelectasis / scarring is seen . No focal consolidation , pleural effusion , or evidence of pneumothorax is seen . The cardiac and mediastinal silhouettes are stable given differences in inspiration . Aortic knob calcification is again seen .
    OUTPUT:
    
No acute cardiopulmonary process . Specifically , no finding to suggest pneumothorax .