Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . A left hilar opacity which is new from ___ with hazy opacification and volume loss of the left upper lobe is concerning for a left hilar mass with distal obstruction . Elevation of the left hemidiaphragm and visualization of the left juxtaphrenic peak is suspicious for extensive left upper lobe volume loss . The right lung is clear . There is no pleural effusion or pneumothorax . Heart size is normal . The right hilar contours are normal . No upper abdominal or acute osseous abnormality is identified .
    OUTPUT:
    
Left hilar opacity with findings suggesting extensive left upper lobe atelectasis associated with an obstructing mass . CT is recommended for further evaluation , preferably with intravenous contrast if possible , to assess further when clinically appropriate . Discussed with Dr . ___ by phone at the time of study interpretation on ___ .