NCIt definition : An uncommon, poorly circumscribed, benign neoplasm arising in the soft tissues of
infants, children and adolescents. It is characterized by the presence of haphazardly
arranged spindle-shaped fibroblasts, collagenous stroma formation, and plaque-like
growth pattern. There is a strong genetic component associating the neoplasm with
Gardner syndrome and deep fibromatosis/desmoid tumor.;