Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright film demonstrates improved aeration in the left lower lung . The previous lucencies likely represented a skin fold . No pneumothorax is identified . However , there continues to be increased opacity in the left upper lung likely representing a small infiltrate . The right lung is clear . Right IJ line tip is in the distal SVC
    OUTPUT:
    
1 . No pneumothorax 2 . Small left upper lobe infiltrate .