An Adult Patient with Systemic Mastocytosis and B-Acute Lymphoblastic Leukemia

Figure 1

Initial bone marrow trephine biopsy showing infiltration by an immature blastoid population in H&E stain (a), which immunohistochemically was positive for CD79a (b) and TDT (c). The presence of a small aggregate consisting of spindle shaped mast cells is also illustrated (d).

(a)

(b)

(c)

(d)