Sanger sequencing showed heterozygous mutation of Kit. Lymph nodes in right inguinal tissue which were positive for MPO, CD117, CD68, CD30, Ki-67 (labeling index 80%), PAX-5, CD21, CD2 and TdT, negative for CD1a, AE1/AE3, and S-100 in immunohistochemical staining indicated co-occuring myeloid sarcoma. The gene discussed is MPO; the disease is myeloid sarcoma.