Small-intestinal involvement in Waldenstrom's macroglobulinemia

Abstract
A patient presented with a three-year history of diarrhea and was found to have a monoclonal gammopathy (IgM lambda) and a malabsorption syndrome with dilatation of the small bowel. Small-intestinal biopsy revealed a homogeneous eosinophilic granular material between the epithelial cells. On electron microscopy this material was shown to consist of an electron-opaque background mixed wit radiolucent lipid sheres. Immunofluorescent studies showed the accellular material to consist entirely of IgM-reactive material. The patient's course and a review of the literature is presented.

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