Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy tube is in unchanged position . The cardiomediastinal and hilar contours are stable and within normal limits . Lung volumes are low . The lungs are clear without focal consolidation , pleural effusion or pneumothorax . Catheter device projects over the upper abdomen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .