Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The ETT terminates within 3 cm of the carina with neck flexion . Right PICC in the mid SVC . Low lung volumes . Linear opacity in the left retrocardiac region is unchanged and represents scarring . Lungs are otherwise clear . Heart size is stable . The mediastinal and hilar contours are stable . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
Low lung volumes , but no evidence of acute cardiopulmonary process .