title: Gastric plasmacytoma with cylindrical crystalline inclusions.
abstract: An 81 year-old female case of extramedullary plasmacytoma of the stomach is reported. Immunohistochemically, the tumor cells contained IgM-lambda immunoglobulin. Electron micrographs of the tumor cells showed centrally located nuclei with nuclear inclusions and cytoplasm filled with crystalline inclusions in the rough endoplasmic reticulum. IgM-lambda producing gastric plasmacytoma with cylindrical inclusions is rare.
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003460:Crystallization; D005260:Female; D005455:Fluorescent Antibody Technique; D006801:Humans; D007075:Immunoglobulin M / Q000032:analysis; D002479:Inclusion Bodies / Q000648:ultrastructure*; D010950:Plasma Cells / Q000648:ultrastructure; D010954:Plasmacytoma / Q000276:immunology / Q000648:ultrastructure*; D013274:Stomach Neoplasms / Q000276:immunology / Q000648:ultrastructure*
chemical_list: D007075:Immunoglobulin M