Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aortic knob is calcified . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is not engorged . A small left pleural effusion is new since the prior CT with associated left lower lobe atelectasis . The right lung is clear . No focal consolidation or pneumothorax is present . Previously noted pulmonary nodules on CT are not clearly visualized on the current radiograph . There are mild degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Interval development of small left pleural effusion with associated left basilar atelectasis .