Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright portable view of the chest demonstrates low lung volumes . There is interval progression of diffuse heterogeneous bilateral opacities , suggestive of multifocal pneumonia . Superimposed mild pulmonary edema is also noted . Left costophrenic angle is not fully imaged . Small right small pleural effusion is likely . No pneumothorax . Hilar and mediastinal silhouettes are unchanged . Heart is mildly enlarged .
    OUTPUT:
    
In comparison to ___ exam , there is interval progression of bilateral heterogeneous opacities , suggestive of multifocal pneumonia .