Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are normal . Lungs are clear . No pleural effusion . No pneumothorax . Pulmonary vasculature is normal . Heart size is normal and unchanged . Mediastinal and hilar contours are normal . Unchanged widening of the intercostal space between left ribs 5 and 6 .
    OUTPUT:
    
No acute intrathoracic abnormality .