Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior film and allowing for differences in technique , there may be a new small left pleural effusion . Otherwise , I doubt significant interval change . Again seen is background COPD , with cardiomegaly , CHF with interstitial and alveolar edema , an slight elevation left hemidiaphragm . Patchy opacity in the right infrahilar region is also again seen .
    OUTPUT:
    
CHF with interstitial and alveolar edema is similar to the prior study . The presence of bibasilar infectious infiltrates would be difficult to exclude in this setting . Possible small new left pleural effusion .