Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacemaker device is noted with leads terminating in the region of the right atrium and right ventricle as well as an abandoned lead within the left anterior chest wall . The patient is status post median sternotomy , CABG , and mitral valve replacement . Heart size remains mildly enlarged with a left ventricular predominance . The aorta is markedly tortuous . Mediastinal and hilar contours are similar . Pulmonary vasculature is not engorged . Elevation of the right hemidiaphragm is chronic with linear opacities in both lung bases compatible with areas of subsegmental atelectasis . There appears to be minimal blunting of the costophrenic angle posteriorly on the left suggestive of the trace left pleural effusion . No focal consolidation or pneumothorax is visualized . There is gaseous distention of colonic loops of bowel . No acute osseous abnormality is identified .
    OUTPUT:
    
Bibasilar atelectasis with trace left pleural effusion . Chronic elevation of the right hemidiaphragm with gaseous distension of the colon .