Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no focal consolidation , pleural effusion or pneumothorax . There is minimal atelectasis at the bases . Median sternotomy wires and clips in the left chest are seen from prior CABG . Mild degenerative changes of the thoracic spine are present .
    OUTPUT:
    
Minimal atelectasis at the lung bases , no acute cardiopulmonary process .