Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A moderate size right pleural effusion is new in the interval with associated right basilar opacity , likely compressive atelectasis though infection can not be excluded . Heart size is difficult to assess given the presence of the pleural effusion that appears at least mildly enlarged . The mediastinal and hilar contours remain unchanged with no pulmonary edema noted . The left lung is clear . No pneumothorax is identified .
    OUTPUT:
    
New moderate size right pleural effusion with right basilar opacity likely reflective of compressive atelectasis but infection can not be excluded .