A Plasmablast or a Plasmacytoid Lymphocyte. Both have a basophilic blue cytoplasm, high nuclear cytoplasmic ratio and a coarse nuclear chromatin. If present in the blood, it would be called a plasmacytoid lymphocyte. Since this is marrow, it might be a plasmablast. Marrow - 100X
Image ID: 0147-100
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