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A 36-year-old man was admitted to Saitama Medical School Hospital, because of a remittent fever which had continued for approximately 6 months, hepatosplenomegaly and lymphadenopathy. He had direct Coombs' test positive auto-immune hemolytic anemia associted with subacute bacterial endocarditis (SBE). The lymphnode demonstrated focal diffuse proliferation of immunoblasts and arborizing vessels with a few small germinal centers, which resembled histological features of the immunoblastic lymphadenopathy. The immunochemical analysis revealed the presence of free IgG Fc fragments in serum. From the above results the patient was diagnosed as immunodysplasia syndrome (IDS) and heavy chain disease (HCD) associated with SBE. It was suggested that the chronic antigenic stimulation due to SBE might have some role in the mechanism of the development of the IDS and HCD in our patient.

A Case Report of the Immunodysplasia Syndrome and Heavy Chain Disease Associated with Subacute Bacterial Endocarditis