Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size remains mildly enlarged . The mediastinal and hilar contours are unchanged with calcified mediastinal and hilar lymph nodes again demonstrated compatible the patient 's history of sarcoidosis . There is no pulmonary vascular congestion . Streaky and linear opacities within the lingula and left lower lobe appear similar compared to the previous exam , and may reflect areas of scarring and / or atelectasis . Minimal patchy opacity within the right lung base could reflect infection or atelectasis . No pleural effusion or pneumothorax is identified .
    OUTPUT:
    
Patchy opacity within the right lung base could reflect atelectasis but infection is not excluded . Probable scarring or linear atelectasis within the left lung base .