Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An endotracheal tube terminates 3 .4 cm above the carina . A nasogastric tube is coiled within the stomach . There is improved aeration of the lungs since the ___ examination . A small left pleural effusion is unchanged . A persistent mild left retrocardiac opacity remains stable .
    OUTPUT:
    
Improved aeration . Persistent mild left retrocardiac opacity and small left pleural effusion .