Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Multiple fractured sternotomy wires are again seen . The heart size is top normal . Upper mediastinal contours are unremarkable . Lung volumes are low but the lungs appear clear without focal consolidation , pleural effusion , or pneumothorax .
    OUTPUT:
    
Low lung volumes but no evidence of acute cardiopulmonary process .