Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable supine AP view of the chest provided . The tip of the endotracheal tube resides in the left mainstem bronchus and retraction by at least 4 cm is advised . The endogastric tube is seen extending into the left upper abdomen with its tip not within the imaged field . The lungs appear clear . Heart is top - normal in size . Hila appear slightly prominent . Mediastinal contour is unremarkable . No pneumothorax or effusion on this supine film . Bony structures appear intact .
    OUTPUT:
    
1 . Left mainstem intubation for which a 4 cm retraction is advised . This finding was flagged on the ED dashboard at the time of this dictation . 2 . Appropriately positioned endogastric tube .