We report the onset of pure red cell aplasia (PRCA) in a patient with a history of polyglandular syndrome including Addison's disease, malabsorption syndrome, diabetes type I and gastric hyperplastic polyposis. An autoimmune origin for this complex disorder was not supported by the presence of organ specific antibodies, but T cells were found to be of polyclonal origin, as demonstrated by molecular analysis of T cell receptor (TCR) gene rearrangement. The pathophysiology of this case, based on laboratory findings and response to therapy, is discussed.
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