Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP image of the chest . The ET tube terminates 1 .5 cm above the carina . An NG tube is seen passing into the stomach and coiling back up superiorly in the stomach . The lung volumes are low . There has been interval development of a retrocardiac opacity , concerning for a developing infectious process . There is blunting of the left costophrenic angle , which could represent a small pleural effusion . There is no right pleural effusion . There is no pneumothorax . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
1 . Interval development of a retrocardiac opacity , concerning for a developing infectious process . 2 . ET tube terminates 1 .5 cm above the carina , recommend pullback for optimal positioning . 3 . NG tube coiled in the stomach , could consider pullback to remove some of redundant NG tubing form stomach .