MPO and autoimmune thrombocytopenic purpura: Bone marrow biopsy and aspirate of the right iliac bone demonstrated a hypercellular marrow with erythroid predominant trilineage hematopoiesis with maturation, mild megakaryocytosis, and decreased iron compatible with a diagnosis of ITP (Figure 2). The myeloperoxidase staining was performed to help exclude myeloid neoplasms and rule out ITP mimickers such as acute myeloid leukemia and myelodysplastic syndrome, especially given the history of anemia, bruising, and epistaxis.