NCIt definition : A self-limited benign neoplasm characterized by a zonal architecture. It is composed
of spindle cells oriented randomly or in short intersecting fascicles. Peripherally,
the spindle cells merge with osteoblasts that rim and populate ill-defined trabeculae
and sheets of unmineralized woven bone, which is surrounded by well-formed trabecular
and cortical-type bone that remodels into lamellar bone. Treatment is usually simple
excision. Prognosis is excellent; recurrence is uncommon. (WHO 2020);