TNFRSF8 and aggressive NK-cell leukemia: The differential diagnosis of IVNKTL is broad and includes the following: extranodal NK/T-cell lymphoma, nasal type; aggressive NK-cell leukemia; EBV-positive nodal T/NK-cell lymphoma; intralymphatic CD30+ large T-cell lymphoma; benign atypical intralymphatic CD30+ T-cell proliferation; and intravascular large B-cell lymphoma.