M85.052

Clinical Causes: Genetic mutations in the GNAS gene, which affect bone development sporadic occurrence with no clear familial pattern No known environmental factors are linked to the development of fibrous dysplasia

Key Symptoms: Bone pain, especially during activity or at night Swelling or a palpable lump over the affected area Pathological fractures, which occur more easily due to weakened bone Deformity or visible swelling of the thigh Decreased range of motion in nearby joints

Diagnosis Path: Diagnosis typically involves a combination of clinical evaluation and imaging studies. X-rays usually reveal characteristic features such as a well-defined, expansile lesion with a ground-glass appearance. Magnetic resonance imaging (MRI) may be used to evaluate the extent of bone involvement and identify any soft tissue abnormalities. A biopsy may be necessary to confirm the diagnosis by examining tissue under a microscope, which shows fibrous tissue replacing normal bone tissue. Blood tests are generally not diagnostic but may be used to rule out other conditions.

Treatment Protocols: Management of fibrous dysplasia focuses on relieving symptoms, maintaining bone strength, and preventing fractures. Treatment options include: - Pain management with medications such as analgesics - Physical therapy to improve mobility and strengthen surrounding muscles - Surgical procedures, such as curettage (removal of abnormal tissue) and bone grafting to restore structural integrity - Internal fixation with plates or rods if there is a fracture or significant deformity - Regular monitoring through imaging to assess disease progression In some cases, bisphosphonates, medications that inhibit bone resorption, may be prescribed to reduce bone pain and stabilize the lesion. The prognosis varies based on the extent of the disease and response to treatment, with many patients managing the condition effectively and leading active lives.