Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unchanged and within normal limits . The lungs are hyperinflated , suggesting the possibility of underlying COPD . The pulmonary vascularity is normal . Linear opacity within the left lung base is compatible with subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process .