Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Increased lucency is noted around the aortic knob , possibly due to left upper lobe collapse . The left perihilar opacity is enlarged and extends superiorly , concerning for possible hematoma . The right lung is clear . Abnormal right paramedian stripe is again seen , reflecting known mediastinal lymphadenopathy , better assessed on recent CT Chest . The heart size is stable . No pulmonary edema .
    OUTPUT:
    
1 . Increased lucency surrounding the aortic knob , concerning for left upper lobe collapse , with possible hematoma around the known left perihilar mass .