Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: NG tube in situ in the stomach . ECG leads chest . Low lung volumes . Interval progression of the bibasal airspace opacification ( left more than right ) with silhouetting of the left hemidiaphragm . Small left - sided pleural effusion .
    OUTPUT:
    
Interval progression of the bibasal airspace opacification ( left more than right ) with an associated small left - sided pleural effusion . These findings most likely represent atelectasis , but in this clinical setting an infective process with or without aspiration should be considered .