Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right upper paramediastinal mass associated with a known goiter appears unchanged . The heart is normal in size . The mediastinal and hilar contours appear unchanged . There are streaky opacities in both lower lungs , which are most suggestive of atelectasis . There is no pleural effusion or pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Bilateral lower lobe opacities , although more suggestive of atelectasis than infection . Stable abnormal bulging expansile right upper paramediastinal contour , known to reflect a goiter .