Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . The endotracheal tube is positioned at the carina . Retraction by at least 3 cm is recommended for more optimal positioning . The NG tube courses into the left upper abdomen with its tip in the region of the stomach . The lungs appear clear . No large effusion or pneumothorax . Cardiomediastinal silhouette appears grossly within normal limits . Bony structures appear intact .
    OUTPUT:
    
1 . Low lying endotracheal tube , positioned at the carina . Recommend retraction by at least 3 cm for more optimal positioning . 2 . NG tube positioned appropriately .