Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without evidence of focal consolidation , pneumothorax or effusions . The cardiomediastinal silhouette is normal . There is calcification of the aortic knob . There is no evidence of pulmonary vascular congestion . Widening of the right acromioclavicular joint is chronic and may represent remote injury . Hardware in the lumbar spine is partially visualized .
    OUTPUT:
    
No acute intrathoracic process .