Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is borderline enlarged . Mild atherosclerotic calcifications are demonstrated at the aortic arch . Mediastinal and hilar contours are unremarkable . Minimal linear atelectasis is noted within the right upper lobe . Patchy opacities in both lower lobes are minimal , and likely relate to areas of atelectasis . The right costophrenic angle is excluded from the field of view . There is minimal blunting of the left costophrenic angle which may be due to trace left pleural fluid . No pneumothorax or pulmonary vascular congestion is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild bibasilar atelectasis . Minimal blunting of the left costophrenic angle suggests a trace left pleural effusion .