Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Assessment is slightly limited by patient positioning . Cardiac silhouette size appears borderline enlarged . Aortic knob is calcified . Mediastinal and hilar contours are grossly unremarkable . The pulmonary vasculature is not engorged . Streaky opacities in the lung bases may reflect areas of atelectasis . No large pleural effusion or pneumothorax is demonstrated . Partially imaged is an inferior vena cava filter in the midline upper abdomen as well as multiple clips in the right upper quadrant of the abdomen .
    OUTPUT:
    
Slightly limited by patient positioning . Mild bibasilar atelectasis .