JAK2 and myelodysplastic syndrome: Myelodysplastic/Myeloproliferative Neoplasm with Ring Sideroblasts and Thrombocytosis (MDS/MPN-RS-T) can also share clinical (leukocytosis and thrombocytosis) and pathological (JAK2 mutation, hyperlobated megakaryocytes, fibrosis) with PMF.