Blast Crisis

**Definition:** An advanced phase of chronic myelogenous leukemia, characterized by a rapid increase in the proportion of immature white blood cells (blasts) in the blood and bone marrow to greater than 30%.

**Tree numbers:** - C04.557.337.539.250.100 - C04.697.098.500.110 - C15.378.190.636.370.100 - C15.378.508.539.250.100 - C23.550.291.500.485.100 - C23.550.727.098.500.110

**Synonyms:** - Blast Phase