Malignant Mastocytosis

**Semantic type:** Neoplastic Process

**Definition:** A group of malignant mast cell disorders including aggressive systemic mastocytosis, mast cell leukemia, mast cell sarcoma, and systemic mastocytosis with an associated myeloid neoplasm. Individuals with advanced systemic mastocytosis have a reduced life expectancy, with median survival measured in months to years.

**Synonyms:** - MAST CELL TUMOR, MALIGNANT - Malignant mast cell neoplasm, unspecified - Malignant mast cell tumor - Malignant mastocytosis