Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta is slightly unfolded . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Subsegmental atelectasis is seen in the left lung base . No focal consolidation , pleural effusion or pneumothorax is present .
    OUTPUT:
    
No acute cardiopulmonary abnormality .