Essential Thrombocythemia

**Semantic type:** Neoplastic Process

**Definition:** A chronic myeloproliferative neoplasm that involves primarily the megakaryocytic lineage. It is characterized by sustained thrombocytosis in the blood, increased numbers of large, mature megakaryocytes in the bone marrow, and episodes of thrombosis and/or hemorrhage. (WHO, 2008)

**Synonyms:** - ET - Essential (hemorrhagic) thrombocythemia - Essential Thrombocytemia - Essential Thrombocytosis - Essential Thrombocytosis - Essential thrombocythemia - Essential thrombocythemia - Idiopathic Thrombocythemia - Idiopathic thrombocythemia - Primary Thrombocythemia - Primary Thrombocytosis - essential thrombocythemia - essential thrombocytosis