CD4 and mature T-cell and NK-cell non-Hodgkin lymphoma: We had studied and discussed the diagnostic criteria of the 2017 WHO, and find that the points to distinguish AITL, follicular T-cell lymphoma and TFH-PTCL including CD4 expression, hyperplasia of FDCs or HEVs and EBV+ CD20+ B blasts are mainly determined by pathology.