Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable chest radiograph demonstrates unchanged examination with a stable moderate right apical pneumothorax . The right - sided presumed pericardial catheter is unchanged in position . The right - sided perihilar opacification is stable . There is , however , slightly decreased opacification of the right lung base .
    OUTPUT:
    
Minimally changed examination with stable right moderate pneumothorax and decreased though persistent right lower lung opacification .