Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . There is a focal opacity in the left hilum due to vessel - on - end configuration which should not be mistaken for a nodule . The hilar and cardiomediastinal contours are normal . There is no pneumothorax or pleural effusion . The pulmonary vascular markings are normal . There is hyperinflation of the lungs as well as flattening of the hemidiaphragm . Degenerative changes of the thoracic spine with several anterior osteophytes are also noted .
    OUTPUT:
    
1 . No lung nodules identified . 2 . Radiographic evidence of mild COPD . 3 . No acute chest pathology identified .