Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are reasonably well expanded , with only trace atelectasis in the left lung base . There is no pleural effusion , pulmonary edema , pneumothorax , or consolidation concerning for pneumonia . The cardiomediastinal silhouette is unremarkable . There is mild bronchial wall thickening , which appears to wax and wane on prior studies .
    OUTPUT:
    
No evidence of pneumonia . Mild bronchial wall thickening could reflect bronchitis .