Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AICD is unchanged with leads extending to the right atrium and right lateral ventricle . Cardiomediastinal silhouette is unremarkable . Linear opacity at the left lung base , likely represents atelectasis or pleural scarring , unchanged . There is no pleural effusion or pneumothorax . No evidence of pulmonary edema . No focal consolidation concerning for pneumonia .
    OUTPUT:
    
No evidence of pulmonary edema .