Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to prior , the lung volumes are low . Left lung base opacity is concerning for pneumonia . There is increase in small left pleural effusion . Bilateral perihilar opacities are suggestive of pulmonary edema . Heart size is unchanged .
    OUTPUT:
    
Left basal pneumonia and worsening pulmonary edema .