Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No significant change in right apical pneumothorax . Mild improvement in left base atelectasis . Cardiomediastinal silhouette is unchanged . Right IJ catheter in unchanged position . Bilateral low lung volumes again noted .
    OUTPUT:
    
No interval change in right apical pneumothorax . Mild improvement in left base atelectasis .