Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right subclavian infusion port ends in the mid SVC . Linear opacities at the left base are stable from prior radiographs and most likely chronic atelectasis . There is no pleural effusion , edema , or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
1 . Chronic left basilar atelectasis . 2 . No evidence of pneumonia .