Multiple myeloma with monoclonal surface immunoglobulin expression: a case report.
BACKGROUND
Plasma cells from patients with multiple myeloma have been found to express the immunophenotype of normal plasma cells without surface immunoglobulin expression.


METHODS
A case occurred of multiple myeloma with monoclonal surface immunoglobulin expression, defined by morphology and flow cytometric immunophenotyping of a fine needle aspiration biopsy of an osteolytic rib lesion and a bone marrow aspirate as well as urine and serum protein electrophoresis with immunofixation.


CONCLUSIONS
The clinical significance of monoclonal surface immunoglobulin expression in rare cases of multiple myeloma is uncertain, and other parameters with clinical significance (CD10 positivity, multiple myeloid antigen expression) will continue to be more useful until additional cases accrue.
Dunphy
C H
CH
Department of Pathology, St. Louis University Health Sciences Center, Missouri, USA.
Galindo
L M
LM
Velasquez
W S
WS
D000911:Antibodies, Monoclonal / Q000276:immunology*; D000912:Antibodies, Neoplasm / Q000276:immunology*; D001707:Biopsy, Needle; D001798:Blood Proteins / Q000032:analysis; D001853:Bone Marrow / Q000473:pathology; D002897:Chromosomes, Human, Pair 7; D004587:Electrophoresis, Agar Gel; D005434:Flow Cytometry; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D009101:Multiple Myeloma / Q000000981:diagnostic imaging / Q000276:immunology* / Q000473:pathology; D010014:Osteolysis; D010950:Plasma Cells / Q000276:immunology; D011507:Proteinuria; D011859:Radiography; D011947:Receptors, Antigen, B-Cell / Q000276:immunology*; D012272:Ribs / Q000276:immunology / Q000473:pathology; D015898:Tomography Scanners, X-Ray Computed
D000911:Antibodies, Monoclonal; D000912:Antibodies, Neoplasm; D001798:Blood Proteins; D007074:Immunoglobulin G; D011947:Receptors, Antigen, B-Cell