Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated and the diaphragms are flattened . There is increased lucency in the retrosternal clear space . There is no focal consolidation or pleural effusion , or pneumothorax . Heart size and mediastinal contours are normal .
    OUTPUT:
    
Hyperinflation without acute cardiopulmonary process .