Case 164. Reference case 164A

       
  Skin biopsy of non-tuberculous mycobacterial infection in the chest wall of 7 y-o male, showing xanthogranulomatous reactions with Langhans-type giant cells (HE).  
       

 

  Infection by Mycobacterium avium is confirmed by culture. The histologic features somewhat resemble those of lepromatous leprosy.