fibrous hamartoma of infancy SCTID:56364004 fibrous hamartoma of infancy fibrous hamartoma NCIT:C3942 infantile fibrous hamartoma MONDO:0006211 MEDGEN:120562 ICD9:215.9 UMLS:C0265979 EFO:1000257 icd11.foundation:1496992098 A poorly circumscribed neoplasm arising from the soft tissues in infants. It is characterized by the presence of bland fibroblastic spindle cells, collagenous stroma formation, primitive mesenchymal round cells, and mature fat cells. These components combined form a distinct organoid pattern. mesenchymal hamartoma