Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were provided . Bibasilar opacities may represent atelectasis in the setting of low lung volumes ; however , infection can not be excluded . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is top normal with a tortuous aorta . The imaged upper abdomen is unremarkable . The bones are intact .
    OUTPUT:
    
Bibasilar opacities may represent atelectasis in the setting of low lung volumes ; however , infection can not be excluded .