Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiomediastinal silhouette and pulmonary vasculature are unremarkable given technique . No definite pleural effusion or pneumothorax is identified . No definite free air is identified inferior to the diaphragms . The lungs are clear .
    OUTPUT:
    
No acute intrathoracic process .