Myelodysplastic/Myeloproliferative Neoplasm with Ring Sideroblasts and Thrombocytosis, Not Otherwise Specified

**Semantic type:** Neoplastic Process

**Definition:** A myelodysplastic/myeloproliferative neoplasm characterized by marked thrombocytosis, anemia, erythroid lineage dysplasia, presence or absence of multilineage dysplasia, 15% or more ring sideroblasts, blasts less than 5% in bone marrow and less than 1% in peripheral blood, absence of BCR/ABL fusion, absence of SF3B1 mutation, absence of genetic abnormalities associated with myeloid/lymphoid neoplasms with eosinophilia and tyrosine kinase gene fusions, and no history of other myelodysplastic/myeloproliferative neoplasms or myeloproliferative neoplasms and myelodysplastic syndromes.

**Synonyms:** - Essential Thrombocythemia with Ring Sideroblasts - MDS/MPN with Ring Sideroblasts and Thrombocytosis - MDS/MPN-RS-T - MDS/MPN-RS-T, NOS - Myelodysplastic/Myeloproliferative Neoplasm with Ring Sideroblasts and Thrombocytosis - Myelodysplastic/Myeloproliferative Neoplasm with Ring Sideroblasts and Thrombocytosis, NOS - RARS-T - Refractory Anemia with Ring Sideroblasts Associated with Marked Thrombocytosis - Refractory anemia with ring sideroblasts associated with marked thrombocytosis