Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes with bronchovascular crowding . Bibasilar opacities likely reflect atelectasis , although aspiration or pneumonia can not be excluded in the right clinical setting . There is no pleural effusion or pneumothorax . Cardiomediastinal silhouette unchanged from prior exam .
    OUTPUT:
    
Bibasilar opacities , likely reflecting atelectasis although aspiration or pneumonia can not be excluded in the right clinical setting .