Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Lung volumes are normal . Linear opacity in the left lower lobe likely represents scarring , previously seen on chest CT ___ . There is no focal consolidation , effusion , or pneumothorax . Cardiomegaly is unchanged in chest radiograph ___ . There is no evidence of mediastinal widening . Median sternotomy wires are again noted . .
    OUTPUT:
    
1 . No evidence of mediastinal widening . 2 . Linear opacity in the left lower lobe likely represents scarring .