Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are clear . Mild Bronchial wall thickening and left perihilar region is a persistent finding . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Persistent mild bronchial wall thickening in left perihilar region , but no current evidence of pneumonia .