Fibroma Bone Unossified

**Non-ossifying fibroma** (ONF) is a benign tumor that develops from immature connective tissue and is covered with several layers of cells similar to the bone matrix. It can grow to sizes of several centimeters or more and leave a person without movement, the need for additional surgery and the opportunity to receive reconstructive prostheses. This tumor is rare and accounts for only a few percent to 1% of all bone tumors. It is more often observed in men aged 20 to 40 years [1].

Main characteristics of the formation There are two terms in the literature - ***non-osteogenic fibroma and non-ossifying fibroma***, which are considered as the same formation. [2] The tumor consists of fibrous, irregular tissue that may be covered by skin. In later stages of development, the tumor may spread to other nearby areas of the body. The formation rarely degenerates into malignant tumors, but can provoke metastasis