Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to prior chest radiograph from ___ , there has been interval worsening of a right lung base opacity . A moderate to large right pleural effusion is unchanged . Asymmetric opacity in the right apex likely relates to degenerative changes of the first rib , unchanged . The left lung is clear . The cardiomediastinal hilar contours are stable . There is mild pulmonary edema which appears worse since ___ .
    OUTPUT:
    
1 . Worsening right basilar opacity could represent atelectasis , but an infectious process however can not be excluded . 2 . Unchanged moderate to large right pleural effusion . 3 . Worsening mild pulmonary edema .