Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . No prior . There is evidence of volume loss in the left hemithorax with increased opacity better characterized on the lateral compatible with left upper lobe collapse . Soft tissue fullness seen in the left hilar region in combination with upper lobe collapse , the S sign of Golden . The right lung is grossly clear . Cardiomediastinal silhouette is within normal limits , noting shift to the left . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
Left upper lobe collapse and fullness of the left hilum worrisome for underlying obstructing mass lesion . CT scan had been ordered at time of dictation , based on discussion between Dr . ___ ___ attending ___ physician .