Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Relatively low lung volumes noted with crowding of the bronchovascular markings . There is no confluent consolidation or large effusion . Median sternotomy wires are noted with fractures through the second and fourth wires . Prosthetic mitral valve is noted . Cardiomediastinal silhouette is within normal limits for technique .
    OUTPUT:
    
No definite acute cardiopulmonary process .