Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Normal lung volumes . Thickened right paratracheal stripe consistent with CT finds of right paratracheal adenopathy . Left lower lobe opacity consistent with mass seen on CT . Right lung is grossly clear . No pneumothorax . Mediastinal contours and hilar structures are normal .
    OUTPUT:
    
No pneumothorax . Left lower lobe opacity most probably mass seen on ___