Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph is compared to prior radiograph dated ___ . Moderate cardiomegaly is stable . A left chest pacer is present , its leads which appear intact and in unchanged position . A right - sided VP shunt catheter is incompletely imaged . Streaky opacity in the retrocardiac region may reflect atelectasis . Relative to prior examination , no new focal opacity convincing for pneumonia is present . There is no evidence of pulmonary edema . There is no pleural effusion or pneumothorax . Cardiomegaly is again noted .
    OUTPUT:
    
Cardiomegaly unchanged . No evidence of pneumonia or edema .