Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube ends approximately 4 cm above the carina and is appropriately positioned and orogastric tube courses below the diaphragm into the stomach . An ill - defined opacity at the right lung base on the prior radiograph has resolved suggesting that it was an aspiration or atelectasis . There are no new lung opacities of concern . Heart size , mediastinal and hilar contours are normal . There is no pleural abnormality .
    OUTPUT:
    
An ill - defined opacity at the right lung base on the prior radiograph has resolved , reflecting either atelectasis or aspiration .