Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . ET tube appears in stable position with its tip 4 cm above the carina . NG tube courses into the left upper abdomen . Mild basal atelectasis noted . Otherwise lungs are clear . Cardiomediastinal silhouette is stable . No acute bony abnormalities .
    OUTPUT:
    
Tubes positioned appropriately . Mild bibasilar atelectasis .