Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Prior central venous catheter is no longer visualized . There are low lung volumes with secondary crowding of the bronchovascular markings . There is no confluent consolidation or significant effusion . Cardiomediastinal silhouette is within normal limits . Median sternotomy wires are intact . No acute osseous abnormalities identified .
    OUTPUT:
    
No definite acute cardiopulmonary process .