Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine portable view of the chest demonstrates endotracheal tube terminating in the left main stem bronchus . The NG tube is positioned in the stomach . There is marked elevation of the right hemidiaphragm . There is apparent volume loss involving right hemithorax with associted rightward shift of midline structures . Right perihilar opacities are again noted , related to patient 's known history of endobronchial metastatic disease . Right upper lobe opacity , likely represents atelectasis due to underventilation . Left lung is clear , without convincing pleural effusion . There is no pneumothorax . The imaged upper abdomen is unremarkable .
    OUTPUT:
    
1 . Endotracheal tube is positioned within the left main stem bronchus . The right upper lobe opacity is largely due volume loss secondary to under - ventilation . 2 . Persistent right perihilar opacity , consistent with patient 's known history of endobronchial metastatic disease . Findings discussed with Dr . ___ at 7 :45 a .m . , ___ by phone .