Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A frontal view of the chest was obtained portably . Low lung volumes result in bronchovascular crowding . Opacity at the right lung base may represent infection or atelectasis . There is no focal consolidation , pleural effusion or pneumothorax . Right hemidiaphragmatic elevation is unchanged . Cardiac and mediastinal silhouettes are unchanged with aortic tortuosity .
    OUTPUT:
    
Right basilar opacity may be pneumonia or atelectasis .