Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube tip projects approximately 5 cm above the carina . Cardiomediastinal silhouette is unremarkable . Calcifications are noted in the aortic arch and the tracheobronchial tree . Lungs are clear . There is no large pleural effusion . No pneumothorax .
    OUTPUT:
    
Satisfactory placement of an endotracheal tube .