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JOURNAL ARTICLE
Acquired angio-oedema caused by IgA paraprotein.
Netherlands Journal of Medicine 1998 January
The syndrome of acquired angio-oedema is characterized by late onset of recurrent bouts of angio-oedema or abdominal pain and may be caused by an acquired deficiency of C1-inhibitor (C1-INH), the inhibitor of the first component of complement. Acquired C1-INH deficiency has been described in approximately 50 patients and is strongly associated with malignant B-cell proliferations. We describe a patient with an 8-year history of recurrent abdominal symptoms and angio-oedema with acquired C1-INH deficiency, caused by the presence of IgA-kappa antibodies that inactivate C1-INH. Analysis of the bone marrow revealed an IgA-kappa monoclonal population of plasma cells, without evidence of overt myeloma. Angio-oedema caused by an autoantibody of the IgA isotype is extremely rare and has never been described in a Dutch patient. Recognition of angio-oedema, both hereditary and acquired, is important because of the therapeutic consequences, as will be discussed.
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