Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable frontal chest radiograph . There are extensive , asymmetric interstitial opacities bilaterally , predominating the left lung . There is improved aeration of the right upper lung , while the degree of opacification in the left upper lung has worsened . These findings are noted on a background of chronic lung disease . There are likely small bilateral pleural effusions . The cardiac silhouette is mildly enlarged , but difficult to evaluate given the parenchymal abnormalities . Dense calcifications are noted within the aortic arch and mitral valve . No pneumothorax noted on this limited study .
    OUTPUT:
    
Bilateral asymmetric and extensive interstitial opacities which could reflect multifocal pneumonia or asymmetric pulmonary edema depending on the clinical setting .