[Angioimmunoblastic T-cell lymphoma presenting with rapidly increasing biclonal gammopathy].

A 59-year-old man was admitted to our hospital with high fever and dysphagia. Physical examination revealed a lingual tumor and swelling of the cervical and inguinal lymph nodes. A lymph node biopsy specimen revealed that the normal nodal architecture had been obliterated by infiltration of small, intermediate, and large pale lymphocytes. Arborous branching of high endothelial venules was also observed. Southern blotting analysis showed rearrangement of the T-cell receptor beta gene. A diagnosis of angioimmunoblastic T-cell lymphoma was made. Serial serum protein fractionation analysis showed rapidly increasing M-protein. Immunofixation electrophoresis indicated specific bands for IgG kappa and IgM lambda, confirming the presence of biclonal gammopathy. Biclonal gammopathy has rarely been reported in patients with angioimmunoblastic T-cell lymphoma. The relationship between the occurrence of biclonal gammopathy and the possible role of HHV-6, HHV-8 and EBV is discussed.