Blast Phase Primary Myelofibrosis

**Semantic type:** Neoplastic Process

**Definition:** Transformation of primary myelofibrosis into acute myeloid leukemia, typically via accelerated phase primary myelofibrosis. Myeloblasts account for 20% or more of the peripheral blood white cells or the nucleated cells in the bone marrow.

**Synonyms:** - Leukemic Transformation of Primary Myelofibrosis