Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post CABG with median sternotomy wires in place . Lung volumes are normal . Minimal bibasilar streaky opacities , slightly improved from prior study , are consistent with atelectasis . There is no focal consolidation , effusion , or pneumothorax . Incidentally noted is an azygos fissure . There is mild unfolding of the descending thoracic aorta . Otherwise , mediastinal and hilar contours are normal . Heart size is normal .
    OUTPUT:
    
No acute intrathoracic process .