Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are stable , with heart size in the upper limits of normal . The right lung is clear . A subtle opacity seen in the left lower hemithorax may represent consolidation or pleural effusion . Mild blunting of the left lateral costophrenic sulcus , indicates the presence of a left pleural effusion . Sternotomy wires are intact .
    OUTPUT:
    
Left lower hemithorax opacity , could represent pleural effusion or early infection . Recommended PA and lateral radiograph for further evaluation .