Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an opacity at the level of the right costophrenic angle , which may represent atelectasis or infection in the appropriate clinical setting . There is background interstitial pulmonary edema . Blunting of the left costophrenic angle suggests a small pleural effusion . No pneumothorax . Mild cardiomegaly . Multiple old left - sided rib fractures are known .
    OUTPUT:
    
1 . Right lung base opacity may represent atelectasis or infection . 2 . Interstitial pulmonary edema .