Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are well inflated . There is a small right pleural effusion with fluid tracking into the minor fissure and possible pleural thickening / scarring at the right lung base . Patchy opacity at the right lung base is presumably atelectasis , however , infection can not be excluded . There is no pneumothorax . There is a small granuloma in the left upper lung . The heart is normal size . There is no evidence for pulmonary edema . The mediastinal and hilar structures are unremarkable .
    OUTPUT:
    
Small right pleural effusion with overlying opacity which could be infection or atelectasis .