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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)
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