Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low , resulting in bronchovascular crowding . The cardiac silhouette remains enlarged . The patient is status post median sternotomy and mitral valve replacement . Sternotomy wires appear intact . There is no pneumothorax , pleural effusion , or consolidation .
    OUTPUT:
    
No acute cardiopulmonary process .