Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacemaker device is noted with leads terminating in the right atrium and right ventricle . Mild enlargement of the cardiac silhouette is re - demonstrated . The mediastinal and hilar contours are unchanged . The pulmonary vasculature is not engorged . Lung volumes are low with minimal patchy opacity in the left lung base compatible with atelectasis . 2 .8 cm elliptical nodule within the right lower lobe is unchanged . No new nodules are demonstrated . No pleural effusion or pneumothorax is present . Moderate degenerative changes in the thoracic spine and moderate to severe degenerative changes of the right glenohumeral joint are again noted .
    OUTPUT:
    
Left basilar atelectasis . Unchanged right lower lobe nodule .