Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable chest x-ray shows moderate hyperinflation and upper lung hyperlucency related to COPD . There are no consolidations suspicious for pneumonia . Band - like opacity in the left retrocardiac region is likely atelectasis . There is no pleural effusion or pneumothorax . Heart size is still top normal .
    OUTPUT:
    
No sign of acute cardiopulmonary process . Small atelectasis in the left lung base in COPD patient .