The lymph node was soft, and the tissue was obtained using the slow-pull technique, which yielded a large tissue with a size > 10 cm, as shown in Fig. 2B. Pathological examination revealed an epithelioid granuloma; moreover, the interferon-gamma release assay for tuberculosis was positive; thus, the patient was diagnosed as having active tuberculosis. The gene discussed is IFNG; the disease is tuberculosis.