Mastocytosis

**Semantic type:** Neoplastic Process

**Definition:** A clonal myeloproliferative neoplasm characterized by the proliferation and accumulation of neoplastic mast cells in one or multiple organs or organ systems. It is a heterogeneous group of neoplasms, ranging from cutaneous proliferations which may regress spontaneously, to aggressive neoplasms associated with organ failure and short survival.

**Synonyms:** - Mast Cell Disease