Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An endotracheal tube tip ends in the mid thoracic trachea approximately 4 cm above the carina . The cardiomediastinal silhouette is normal . A patchy opacity at the right base , unchanged from prior radiograph , could represent atelectasis , although aspiration is also possible . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Endotracheal tube tip in appropriate position ending approximately 4 cm above the carina .