systemic mastocytosis indolent systemic mastocytosis https://www.malacards.org/card/indolent_systemic_mastocytosis Orphanet:98848 MONDO:0020331 ISM ICDO:9741/1 GARD:0019595 NCIT:C9286 ONCOTREE:ISM icd11.foundation:353283231 DOID:4660 indolent systemic mastocytosis (morphologic abnormality) ism MedDRA:10056452 MEDGEN:82897 SCTID:70910003 Indolent systemic mastocytosis (ISM) is a benign form of systemic mastocytosis (SM) characterized by an abnormal proliferation of mast cells either only in bone marrow or in numerous tissues. UMLS:C0272203