Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrate a left chest dual lead pacer , its leads which appear intact and in unchanged position relative to prior study . Lungs are clear without focal opacity convincing for pneumonia . Patchy opacity in the left costophrenic angle is likely related to pleural thickening or post inflammatory changes . The heart is enlarged though stable relative to study dated ___ . There is no evidence of pulmonary edema . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of pneumonia .