ERG and acute myeloid leukemia: From a morphological perspective, the typical characteristics of FUS::ERG positive AML are eosinophilia, micromegakaryocytes, hemophagocytosis, and vacuolation of leukemic cells.[21] In contrast, this typical feature has not yet been seen in the bone marrow of HNRNPH1::ERG positive AML cases, which is certainly related to the small number of cases.