What Is a Nonossifying Fibroma?

Non-ossifying fibroma is a metaphyseal hamartoma composed of tissue fibroblasts. Cortical defect. At present, small lesions, no clinical symptoms, and lesions confined to the subperiosteal or intracortical are called metaphyseal fibrous defects or fibrocortical defects, while larger lesions, lesions can expand into the medullary cavity and often have pathological fracture It is called non-ossifying fibroma or non-ossifying fibroma, so non-ossifying fibroma and fibrocortical defect are two different types of non-ossifying fibroma or two different in the same disease. which performed.

Basic Information

nickname

Metaphyseal fibrous defect, non-osteoblastic fibroma

English name

non-ossifying fibroma

Visiting department

orthopedics

Multiple groups

Children and adolescents, most common between 5 and 20 years old

Common locations

Lower limb long bones

Common symptoms

Knee, ankle or hip pain

Causes of non-ossifying fibroma

The cause is unknown.

Clinical manifestations of non-ossifying fibroma

Non-ossifying fibroids are most common in children and adolescents, and most common between the ages of 5 and 20. Long bones are most common in the lower extremities, mainly around the knee joint. The distal metaphysis of the femur is most common, followed by the proximal tibia and distal metaphysis, and the proximal metaphysis of the fibula is also common.

Non-ossifying fibroids can also have multiple lesions, they can occur in different parts of the same bone, or they can occur in different bones. This type of multiple non-ossifying fibroma is called the age of onset and single. Multiple lesions are most common in single or double lower limbs and can involve the pelvic bone.

Nonossifying fibroma examination

Non-ossifying fibroids have typical X-ray characteristics. The lesion starts at the metaphysis of long bones, close to the epiphyseal plate, and always swells on one side of the cortex. The eccentricity can gradually migrate to the backbone with bone growth and development. The inside is a clear and translucent shadow, with a leaf-shaped oval shape, and a hardened edge around it. The longitudinal axis of the lesion is consistent with the long bone, and the lesion is as small as 1 cm and as large as 15 cm. Lesions develop that invade the medullary cavity, destroy the entire metaphysis, cause the entire cortex to become thin, and cause pathological fractures. The lesions can enlarge with the growth of the diaphragm, and the lesion may stop growing after the diaphragm is closed.

Multiple non-ossifying fibroids also have typical features on imaging. There may be multiple lesions in the same bone, or they may not be in the same bone.

Nonossifying fibroma diagnosis

Children, adolescents have pain in the knee, ankle, or hip joints. The images show non-ossifying fibroids, which are often misdiagnosed as other tumors.

Imaging is not easy to diagnose when the non-ossifying fibroma lesions invade to most or the entire metaphysis or the backbone. Some lesions are easily confused with poor fibrous structure, cartilage myxoid fibroids, and bone cysts, and often require surgical confirmation.

In the case of multiple lesions, the imaging characteristics can be confused with fibrous dysplasia. Histologically, non-ossifying fibroids and fibrous dysplasia are consistent in certain lesions. Make a difference.

Non-ossifying fibroma treatment

Asymptomatic non-ossifying fibroma does not require treatment. Occasionally found lesions can be followed up regularly. For symptomatic lesions, when the lesions continue to expand and have a tendency to fracture, the lesions can be removed by bone grafting, which has a good prognosis. For small lesions, simple curettage can be performed without bone grafting, and can be followed up. The lesion may heal itself.