Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP image of the chest . Lungs are well expanded . There is an opacity in the right lung base which may reflect atelectasis , however can not exclude aspiration or pneumonia in the right clinical setting . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
Right lung base opacity , likely representing atelectasis but can not exclude aspiration or pneumonia in the right clinical setting . These findings were communicated to Dr . ___ at 11 :50 p .m . on ___ by phone .