Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs were obtained . The lungs are low in volume with an opacity in the superior segment of the right lower lobe . There is no pleural effusion or pneumothorax . The heart is normal in size with normal cardiomediastinal contours .
    OUTPUT:
    
Opacity in the superior segment of the right lower lobe could reflect atelectasis particularly given low lung volumes , however infection should be considered in the appropriate clinical setting . Consider repeat evaluation with improved inspiration when patient is able .