Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouettes are stable and within normal limits . The hila are within normal limits . There is volume loss of the left upper lung . The lungs are clear without focal consolidation . There is no pulmonary vascular congestion . There is no pneumothorax or pleural effusion . Deformity of the left posterior sixth rib is again noted .
    OUTPUT:
    
No acute cardiopulmonary process .