Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear without confluent consolidation . Linear opacity within the left lung base likely reflects subsegmental atelectasis . There is no interstitial pulmonary edema or large pleural effusions . Cardiomediastinal and hilar contours are within normal limits and unchanged compared to recent prior examination . There is minimal pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary process . No pneumonia .