BM aspirate.

(A) Initial BM smear showing vacuoles in the erythroid precursors, dyspoietic changes, several RSs (inset), and iron granules in plasma cell cytoplasm (arrowhead) (original magnifications, × 890). (B) BM aspirate smears (initial BM aspirate) showing several plasma cells containing blue-black particulate material in the cytoplasm that stained positive with Prussian blue reaction (hemosiderin deposits) (original magnification, × 970).