Fig. 4From: Primary extramedullary plasmacytoma of the sigmoid colon with perforation: a case reportImmunohistochemical examination. a, b In situ hybridization shows that most of the tumor expresses immunoglobulin G and lambda light chain mRNA. IgG, immunoglobulin G; λ-LC, lambda light chain. c In contrast, there is no expression of kappa light chain mRNA. κ-LC, kappa light chainBack to article page