Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the most recent CT exam , there has been interval development of a moderate to large right - sided pleural effusion with associated right basilar atelectasis . Rounded opacity within the right lung base likely reflects a metastatic lesion . Other known pulmonary nodules within the lungs are not well seen on the current exam . There is no left - sided pleural effusion or pneumothorax . Pulmonary vasculature is normal . Assessment of the cardiac silhouette size is difficult given the presence of the right pleural effusion . Fullness of the right mediastinal contour is compatible with underlying lymphadenopathy , and appears relatively unchanged compared to the prior CT exam . No acute osseous lesion is demonstrated .
    OUTPUT:
    
Moderate to large right pleural effusion with right basilar atelectasis . Rounded opacity within the right lung base likely reflects a metastatic lesion . Unchanged mediastinal lymphadenopathy .