Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is minimal left base atelectasis . Otherwise , the lungs are clear without focal consolidation . No large pleural effusion is seen . There is no pneumothorax . Aortic knob calcification is seen . Otherwise , the cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Minimal left base atelectasis . Otherwise , no acute cardiopulmonary process .