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Bone marrow (BM) involvement of blastic plasmacytoid dendritic neoplastic cells (2a-c, case 3; 2d-f, case 4). The neoplastic cells in BM smears are diffusely positive for CD123 (2a), CD303 (polyclonal) (2b), and TCL1 (2c) in a leukemic case. The neoplastic cells in BM clots are positive for CD123 (2d), CD303 (polyclonal) (2e), and CD303 (124B3.13) (2f) in a minimal BM involvement case.
