Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate to large right pleural effusion appears relatively unchanged compared to the most recent radiograph . Right basilar opacity likely reflective of atelectasis appears slightly worse in the interval . Heart size is difficult to assess , but appears grossly unchanged as are the mediastinal and hilar contours . Left lung is clear . There is no left - sided pleural effusion . No pneumothorax or pulmonary vascular congestion is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Similar appearance of moderate to large right pleural effusion . Interval worsening of right basilar atelectasis . Infection can not be completely excluded in the right lung base .