TKT and Increased total eosinophil count: Experiences from recent bone marrow (BM) workshops on eosinophilic disorders and mastocytosis, including myeloid/lymphoid neoplasms with eosinophilia and tyrosine kinase gene fusions (M/LN-eo-TK), provide evidence that FCM has an important role in recognizing these rare entities [23, 24].