Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Median sternotomy wires and a tracheostomy are stable in position . The heart is top normal in size , but not significantly changed in size from the prior exam . Lung volumes are slightly low which accentuates bronchovascular markings . There is no focal consolidation , pleural effusion or pneumothorax identified . The osseous structures are within normal limits .
    OUTPUT:
    
No acute cardiopulmonary abnormality .