Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph shows improved aeration at the right lung base , presumably status post right - sided thoracentesis . No pneumothorax is visible . The left hemidiaphragm remains obscured and there appears to be increased haziness of the mid and upper lung zone compared to the study from eight hours earlier . Some of this may be exaggerated because of increased rotation . Left - sided PICC line tubing may be slightly pulled back and now is at the level of the mid superior vena cava .
    OUTPUT:
    
No visible pneumothorax status post thoracentesis ( presumably on the right ) .