Systemic Mastocytosis

**Semantic type:** Neoplastic Process

**Definition:** Systemic infiltration of extracutaneous sites by clonal mast cells, with or without evidence of skin involvement.

**Synonyms:** - Systemic Tissue Mast Cell Disease - Systemic mastocytosis - Systemic mastocytosis, NOS - Systemic tissue mast cell disease - systemic mastocytosis