Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Semi-erect portable AP chest radiograph demonstrates low lung volumes . Atelectasis at the bases is noted . No focal opacity convincing for pneumonia is present . Cardiomediastinal and hilar contours are within normal limits . There is no pneumothorax . No evidence of pulmonary edema .
    OUTPUT:
    
Small lung volumes with atelectasis . No focal opacity convincing for pneumonia .