MLN and systemic mastocytosis: There is a large spectrum of clinical manifestations for MLN-TK, which may mimic CEL, other myeloproliferative neoplasms (MPN), systemic mastocytosis (SM), myelodysplastic neoplasm (MDS), myelodysplastic/myeloproliferative neoplasms (MDS/MPN), T- or B-lymphoblastic leukemia, or acute myeloid leukemia (AML).