Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior study , there has been interval thoracentesis , with removal of fluid from a left apical hydro pneumothorax . The aerated portion of the pneumothorax remains , unchanged in size compared to the prior study . The appearance of the right hemi thorax is stable . The cardio mediastinal silhouette is also unchanged .
    OUTPUT:
    
Expected appearance status post thoracentesis with removal of fluid from a left apical hydro pneumothorax .