Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Median sternotomy wires appear intact . A left chest wall pacer - defibrillator has leads terminating in the right atrium and right ventricle . Numerous surgical clips project over the anterior mediastinum from prior coronary artery bypass . Lung volumes are slightly low similar to the prior study . Previous pulmonary edema is significantly improved except for residual and some atelectasis in the lung bases . There is no large pleural effusion or pneumothorax . Moderate cardiomegaly is unchanged . The mediastinal and hilar contours are normal .
    OUTPUT:
    
1 . Interval improvement in pulmonary edema . 2 . Stable moderate cardiomegaly . 3 . Mild bibasilar atelectasis .