Leukemia, Mast-Cell

**Definition:** A form of systemic mastocytosis (MASTOCYTOSIS, SYSTEMIC) characterized by the presence of large numbers of tissue MAST CELLS in the peripheral blood without skin lesions. It is a high-grade LEUKEMIA disease with bone marrow smear of >20% MAST CELLS, multi-organ failure and a short survival.

**Tree numbers:** - C04.557.337.440 - C04.557.337.539.275.440 - C15.378.508.440 - C15.378.508.539.275.440 - C20.762.750.750.500

**Synonyms:** - Mast-Cell Leukemia