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'Rouleaux formation' in blood of a patient with chronic polyarthritis

'Rouleaux formation' in blood of a patient with chronic polyarthritis

'Rouleaux formation' is not specific for multiple myeloma or lymphoma. Also polyclonal immunoglobulins can cause 'rouleaux formation' (->) in peripheral blood (May-Grünwald-Giemsa stain), as shown in this patient with chronic polyarthritis.