Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single upright frontal chest radiograph was obtained . The exam is limited by low lung volumes . Opacity at the right base has been has progressed since the prior films . There is no effusion or pneumothorax . There is extensive gastric distention of the stomach .
    OUTPUT:
    
Worsening right lower lobe opacity concerning for infection .