Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been marked interval increase in parenchymal opacities , now seen diffusely throughout both lungs . These appear predominately comprised of increased interstitial markings , but with areas of confluence . Small right pleural effusion is slightly larger . No definite left effusion . Left - sided line central line unchanged , tip over distal SVC . No pneumothorax detected .
    OUTPUT:
    
Marked interval increase in diffuse bilateral opacities . Time course is most suggestive of CHF with interstitial and probably also with some degree of alveolar edema . Diffuse infection or ARDS is considered less likely , but remains in the differential .