Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes which results in bronchovascular crowding . Bibasalar opacification likely represents atelectasis or aspiration . Superimposed infection could be considered in the appropriate clinical setting . Small left - sided pleural effusion . There is no pneumothorax . The cardiomediastinal and hilar contours are unchanged .
    OUTPUT:
    
Bibasalar opacification likely represents atelectasis or aspiration , however superimposed infection could be considered in the appropriate clinical setting .