Systemic mastocytosis with an associated clonal hematological non-mast cell lineage disease is a form of systemic mastocytosis (SM) associated with malignancy (other than mast cell leukemia). The disease is systemic mastocytosis with an associated clonal hematologic non-mast cell lineage disease (MONDO_0020332). Also known as: SM-AHN, SM-AHNMD, SMAHN, systemic mastocytosis with an associated haematological neoplasm, systemic mastocytosis with an associated haematological neoplasm (SM-AHN), systemic mastocytosis with an associated hematological neoplasm, systemic mastocytosis with an associated hematological neoplasm (SM-AHN), systemic mastocytosis with associated clonal haematological non-mast cell lineage disease.