PTPRC and B-cell non-Hodgkin lymphoma: The tumor cells were strongly positive for LCA (Leukocyte Common Antigen), but negative for AE1/AE3, Desmin, and S-100 (Figure 2B), suspecting it could be a hematopoietic malignancy, including myeloid sarcoma, B-cell lymphoma and T/NK-cell lymphoma.