Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacity within the left lung base abutting the costophrenic angle is unchanged from prior and likely reflects atelectasis . The lungs are otherwise clear . No confluent consolidation is identified . There is no pulmonary edema or pleural effusions . Cardiomediastinal and hilar contours are within normal limits . There is no pneumothorax . Cervical spinal hardware is partially imaged , though appears unchanged from prior .
    OUTPUT:
    
No acute cardiopulmonary process