Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low . The cardiomediastinal silhouette and pulmonary vasculature are stable since the prior examinations . There is stable elevation of the left hemidiaphragm . Aortic knob calcifications are similar to the prior examination . There is no pleural effusion or pneumothorax . No definite consolidation is identified .
    OUTPUT:
    
No acute intrathoracic abnormality .