Abstract
A 74-year-old woman presented with multiple brain infarctions, an inflammatory reaction, and a high serum titer (414 U/ml) of myeloperoxidase-specific antineutrophil cytoplasmic antibody (MPO-ANCA) with no hematological abnormalities. After the inflammation and ANCA titers were resolved with steroid therapy for suspected microscopic polyangiitis, hemophagocytic syndrome developed. Biopsies revealed non-Hodgkin's intravascular lymphoma (IVL). The flare of IVL with negative serum ANCA suggested that the initial high serum MPO-ANCA had not originated from tumor cells.
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