Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Patient is known to have severe emphysema as seen on prior CT of the chest . A hazy opacity in the right mid lung is new and may represent pneumonia . Elevated right hemidiaphragm is unchanged . The heart size can not be assessed . The mediastinal contour is markedly abnormal due to an unfolded thoracic aorta . No large pneumothorax . Bony structures are demineralized . An old deformity of the right humeral neck is noted as well as arthroplasty of the left shoulder .
    OUTPUT:
    
Subtle opacity in the right mid lung is concerning for pneumonia . Severe emphysema .