Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Multiple diffuse rounded opacities , many of which were previously identified on chest CT from ___ , are present and are consistent with known metastatic pulmonary nodules . Some nodules identified on prior chest CT examination are difficult to appreciate on today 's film . Overall , size of the right perihilar and upper lobe lesions are not essentially changed . The mediastinal and hilar contours are stable . A right Port - A - Cath catheter terminates in the low SVC . There is no definite pneumothorax or pleural effusions .
    OUTPUT:
    
Multiple diffuse rounded opacities consistent with known pulmonary metastasis . No definite pneumothorax .