Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest radiograph . The patient has been extubated in the interim . The right IJ catheter and NG tube have been removed . Mediastinal drain and left - sided chest tube are stable in position . Left apical pneumothorax is no longer visible . Median sternotomy wires are intact . Pneumopericardium has decreased in the interim . New left lower lobe opacity probably represents atelectasis .
    OUTPUT:
    
1 . Resolved left apical pneumothorax . 2 . Left lower lobe atelectasis .