Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . Linear opacity within the right lung base likely reflects subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is seen . Mild elevation of the right hemidiaphragm is unchanged .
    OUTPUT:
    
No acute cardiopulmonary abnormality .