Histopathology confirmed xanthogranulomatous infiltration with foamy histiocytes and Touton giant cells, with immunohistochemistry showing CD68-positive, CD163-positive, CD1a-negative, and S100-negative cells lacking Birbeck granules, consistent with non-Langerhans cell histiocytosis. The gene discussed is CD68; the disease is Langerhans cell histiocytosis.