Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right pectoral pacemaker sends leads to the right atrium and right ventricle . Two right - sided chest tubes , a right midline catheter , the left IJ central venous line , ET tube and nasogastric tube are unchanged in position . Sternotomy wires are intact and aligned . There is no pneumothorax . Slightly increased opacification at the left base is most likely due to atelectasis . The heart and mediastinum are within normal limits despite the projection .
    OUTPUT:
    
New minimal left basilar subsegmental atelectasis . Otherwise no significant interval change .