Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No focal consolidation is seen . Mild hyperinflation of the lungs . There is no pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are stable and unremarkable . Moderate severe multilevel degenerative changes . Prior lumbar posterior decompressive surgery , partially imaged .
    OUTPUT:
    
No pneumonia or acute cardiopulmonary process .