Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is difficult to assess given the presence of a moderate size right pleural effusion , which has increased compared to the prior exam . The mediastinal contours are unremarkable . There is mild pulmonary vascular congestion , but this appears somewhat improved compared to the previous exam . Right basilar opacity may reflect compressive atelectasis , though infection can not be excluded in the correct clinical setting . No left - sided pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
1 . Interval increase in size of moderate right pleural effusion . Right basilar opacity likely reflects compressive atelectasis though infection is difficult to exclude . 2 . Mild pulmonary vascular congestion , improved compared to the previous exam .