Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . There is a persistent large right pleural effusion with slight improvement in aeration of the anterior segment of the right upper lobe . A right perihilar opacity corresponds to the patient 's known mass that is better assessed on CT scan from ___ . Multiple nodules are present in the left lung , consistent with known metastatic disease . There is no pleural effusion on the left . There is no pneumothorax . Mediastinum is midline . Heart size is difficult to assess due to intraparenchymal abnormalities .
    OUTPUT:
    
1 . Small improvement in aeration of the anterior segment of the right upper lobe following thoracentesis . 2 . Large area of opacification remain in right lung secondary to persistent effusion and central obstruction .