Fig. 2

a Solitary Extramedullary plasmacytoma of lymph node: Lymph node architecture is partially effaced with few residual follicles and is infiltrated by neoplastic cells. b Solitary Extramedullary plasmacytoma of tonsil: Neoplastic infiltration noted on either side of the tonsillar cleft that is lined by intact squamous epithelium. c Neoplastic plasmacytoid cells in diffuse sheets. d Neoplastic cells with eccentrically placed round to oval nuclei and vesicular chromatin. Perinuclear halo are noted in some. e A case of SEP with monoclonal lambda positivity. f A case of SEP with monoclonal kappa positivity. g Neoplastic cells with MUM1 positivity. h Neoplastic cells with diffuse CD138 positivity. i Low proliferative index in neoplastic cells with Ki-67 immunomarker. j Negative LCA expression. k Negative CD20 expression. l Negative CD3 expression