Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate hyperexpanded lungs , the chest diameter is increased in AP dimension . Lungs are clear without pleural effusion , focal consolidation , or pneumothorax . Hilar and mediastinal silhouettes are unremarkable . Heart size is normal . There is no pulmonary edema . Bronchial wall thickening is most evident at lung bases .
    OUTPUT:
    
Hyperexpanded lungs , compatible with underlying chronic obstructive pulmonary disease . Bronchial wall thickening may reflect chronic or acute bronchitis .