Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal and unchanged . The mediastinal and hilar contours are similar . Atherosclerotic calcifications are noted at the aortic knob . The pulmonary vasculature is not engorged . Biapical opacities are again noted , with streaky left basilar opacity likely reflective of atelectasis . There may be a trace left pleural effusion as there is blunting of the left costophrenic angle . No pneumothorax or pulmonary edema is demonstrated . No acute osseous abnormality is detected .
    OUTPUT:
    
1 . Unchanged biapical pulmonary opacities , which have been previously characterized on chest CT from ___ and PET - CT from ___ . If clinically indicated , further assessment with a dedicated chest CT can be obtained for direct comparison . 2 . Left basilar atelectasis and probable trace left pleural effusion .