Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . Mild atelectasis is seen in the retrocardiac left lung base . Mild blunting of the left lateral costophrenic sulcus may be secondary to a small pleural effusion versus pleural scarring . No consolidation , pulmonary edema , or pneumothorax is seen . Imaged upper abdomen demonstrates two percutaneous biliary drainage catheters , similar in appearance to the earlier study of ___ .
    OUTPUT:
    
Left basal atelectasis / scarring . No acute cardiopulmonary pathology .