Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In the interval since the prior study there has been some clearing of the bilateral airspace opacities , particular in the left upper lobe . There is residual airspace opacity evidence however with prominence of the bilateral hila . No pleural effusion seen . No pneumothorax seen . A nasogastric tube terminates in the stomach . An endotracheal tube terminates 6 cm above the level of the carina . .
    OUTPUT:
    
Slight interval improvement in the degree of aeration in the bilateral lungs , most obvious in the left upper lobe .