Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . There is mild - to - moderate relative elevation of the left hemidiaphragm . Heterogeneous opacification of each lung is predominantly visible in the upper lungs and also obscures a known left upper lobe nodule . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
New heterogeneous opacification of each lung . Differential considerations include widespread pneumonia or pulmonary edema among other less common causes .