Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube ends 4 .2 cm from the carina and is appropriate in position . An orogastric tube courses below the diaphragm into the stomach , however , distal end is off the radiograph view . Increased retrocardiac density , which was new yesterday reflecting aspiration or atelectasis has completely resolved . Mild right lower lung opacity due to small effusion and right basal atelectasis is unchanged since ___ , but decreased since ___ . Heart size , mediastinal and hilar contours are normal . The left lung and right upper lung are clear .
    OUTPUT:
    
Left lower lung aspiration / atelectasis which was new on yesterday 's radiograph has completely resolved . Mild right basal opacity due to small effusion and atelectasis is unchanged since yesterday , but improved since ___ .