Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the chest radiograph obtained 2 days prior , no significant changes are appreciated . Compared to 3 days prior , there has been development of mild interstitial edema . Heart size top - normal . Pleural effusions small , if any . Extensive pleural calcifications partially obscure portions of both lungs and somewhat limit evaluation for consolidations . However , no focal consolidations are identified to suggest pneumonia . Heart size top - normal . Pleural effusions small , if any .
    OUTPUT:
    
Mild pulmonary edema . No radiographic evidence of pneumonia .