Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright AP view of the chest provided . The tip of the endotracheal tube resides approximately 1 .9 cm above the carina . NG tube courses into the left upper quadrant . Left basal retrocardiac linear density is most compatible with atelectasis , though a small component of aspiration is not excluded . Right lung is clear . Cardiomediastinal silhouette is grossly unremarkable . No bony abnormalities .
    OUTPUT:
    
ET tube positioned 1 .9 cm above the carina . Consider slight retraction by approximately 1 cm for more optimal positioning . Left lower lobe atelectasis versus small volume aspiration .