Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest are compared to previous exam from ___ . Postoperative changes with posterior spinal fixation hardware are again seen . Asymmetry of the thoracic cavities is again noted with chronic deformities of the ribs . The lungs , however , appear grossly clear without confluent consolidation nor effusion . Cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
No definite acute cardiopulmonary process .