Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable supine chest x-ray shows low lung volume but without consolidation or nodules . Cardiomediastinal silhouette is normal . Tubular opacity in the right upper paramediastinal border is due to azygos lobe . Left pleural drain has tip ending at the left lung base . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No sign of acute cardiopulmonary processes , no pneumothorax . Left pleural drain ends at the left lung base .