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Bone marrow cytology of a patient with immunocytoma

Bone marrow cytology of a patient with immunocytoma

Bone marrow cytology (May-Grünwald-Giemsa stain) of a patient with immunocytoma showing a dense infiltration of small lymphocytes (L), lymphoplasmacytic cells (LP), a few plasma cells (P) and mast cells (M). The cells produce monoclonal IgM, characterising it as a Waldenström's disease.