Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternotomy wires and mediastinal clips are compatible with prior CABG surgery . The heart size is within normal limits . Marked dextroscoliosis of the thoracic spine limits fine assessment of the mediastinal and hilar contours , which appear to be grossly normal . The lung volumes are low , but clear of consolidation . There is no large pleural effusion or pneumothorax . There is no subdiaphragmatic free air ; gas projecting over the right upper quadrant of the abdomen is within the hepatic flexure of the colon . A compression deformity of the lower thoracic spine is at least a year old .
    OUTPUT:
    
Post - CABG changes and scoliosis , but no evidence of acute cardiopulmonary process or subdiaphragmatic free air .