Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs demonstrate median sternotomy wires which appear intact . Several clips project over the left mediastinal border . A left dual lead pacing device is present , its leads which are intact and in unchanged position relative to examination dated ___ . Heart size is stable , within normal limits . There is no evidence of pulmonary edema . Lungs are clear without a focal opacity convincing for pneumonia . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No acute intra thoracic abnormality .