The pathological diagnosis was MALT lymphoma with light chain-restricted plasmacytic differentiation (Fig 1E), the immunophenotype of lymphoma cells: CD20 (+, positive control +), CD19 (+), CD22 (+), CD79a (+), PAX-5 (+), PAX8 (+), BCL2 (+), MNDA (+), CD21 and CD35 (a little +, FDC networks +), CD3 (-), CD5 (-), CD43 (-), CD10 (-), BCL6 (-), IgD (-), CD1a (-), TDT (-), CD117 (-, positive control+), P53 (partial+, wild-type), Ki-67 LI (about 5%); the immunophenotype of plasma cells: MUM1 (+), κ (+), λ (a little +, monoclonal); EBER CISH(-, positive control +); IgM (-). Here, CD40LG is linked to MALT lymphoma.