Fibrous dysplasia is a very rare[2]nonhereditary genetic disorder where normal bone and marrow is replaced with fibrous tissue, resulting in formation of bone that is weak and prone to expansion. As a result, most complications result from fracture, deformity, functional impairment, pain, and the impingement of nerves.[3] Disease occurs along a broad clinical spectrum ranging from mostly asymptomatic incidental lesions, to severe disabling disease. Disease can affect one bone (monostotic), multiple (polyostotic), or all bones (panostotic)[4][5] and may occur in isolation or in combination with café au lait skin macules and hyperfunctioning endocrinopathies, termed McCune–Albright syndrome.[3] More rarely, fibrous dysplasia may be associated with intramuscular myxomas, termed Mazabraud's syndrome.[6] Fibrous dysplasia is very rare, and there is no known cure.[2] While fibrous dysplasia is not itself a form of cancer, in severe cases it may undergo a malignant transformation into cancers such as osteosarcoma or chondrosarcoma, so some clinicians may regard it as precancerous rather than benign.
Presentation
Fibrous dysplasia of the right zygomatic bone (left). Corresponding T2-weighted MRI (left) and CT (right) of the same patient.
Fibrous dysplasia is a mosaic disease that can involve any part or combination of the craniofacial, axillary, and/or appendicular skeleton.[7] The type and severity of the complications therefore depend on the location and extent of the affected skeleton. The clinical spectrum is very broad, ranging from an isolated, asymptomatic monostotic lesion discovered incidentally, to severe disabling disease involving practically the entire skeleton and leading to loss of vision, hearing, and/or mobility.[citation needed]
Individual bone lesions typically manifest during the first few years of life and expand during childhood. The vast majority of clinically significant bone lesions are detectable by age 10 years, with few new and almost no clinically significant bone lesions appearing after age 15 years.[8] Total body scintigraphy is useful to identify and determine the extent of bone lesions, and should be performed in all patients with suspected fibrous dysplasia.[3]
Children with fibrous dysplasia in the appendicular skeleton typically present with limp, pain, and/or pathologic fractures. Frequent fractures and progressive deformity may lead to difficulties with ambulation and impaired mobility. In the craniofacial skeleton, fibrous dysplasia may present as a painless “lump” or facial asymmetry. Expansion of craniofacial lesions may lead to progressive facial deformity. In rare cases, patients may develop vision and/or hearing loss due to compromise of the optic nerves and/or auditory canals, which is more common in patients with McCune-Albright syndrome associated growth hormone excess.[9] Fibrous dysplasia commonly involves the spine, and may lead to scoliosis, which in rare instances may be severe.[10] Untreated, progressive scoliosis is one of the few features of fibrous dysplasia that can lead to early fatality.
Bone pain is a common complication of fibrous dysplasia. It may present at any age, but most commonly develops during adolescence and progresses into adulthood.[7]
Fibrous dysplasia is not hereditary, and there has never been a case of genetic inheritance from parent to child.[citation needed]
Diagnosis
On x-ray, fibrous dysplasia appears as bubbly lytic lesions, or a ground glass appearance. Computerized tomography (CT) or magnetic resonance imaging (MRI) scans may be used to determine how extensively bones are affected. CT can better demonstrate the typical "ground glass" appearance, which is a highly specific radiological finding, while MRI can show cystic areas with fluid contents.[15] A bone scan uses radioactive tracers, which are injected into your bloodstream. The damaged parts of bones take up more of the tracer, which show up more brightly on the scan. A biopsy, which uses a hollow needle to remove a small piece of the affected bone for laboratory analysis, can diagnose fibrous dysplasia definitely.[citation needed]
Treatment
Treatment in fibrous dysplasia is mainly palliative, and is focused on managing fractures and preventing deformity. There are no medications capable of altering the disease course. Intravenous bisphosphonates may be helpful for treatment of bone pain, but there is no clear evidence that they strengthen bone lesions or prevent fractures.[16][17] Surgical techniques that are effective such as bone grafting, curettage, and plates and screws, are frequently ineffective against the Polyostotic version of fibrous dysplasia but often effective against monostotic fibrous dysplasia.[18][19]Intramedullary rods are generally preferred for management of fractures and deformity in the lower extremities.[19] Progressive scoliosis can generally be managed with standard instrumentation and fusion techniques.[20] Surgical management in the craniofacial skeleton is complicated by frequent post-operative FD regrowth, and should focus on correction of functional deformities.[21] Prophylactic optic nerve decompression increases the risk of vision loss and is contraindicated.[22]
Managing endocrinopathies is a critical component of management in FD. All patients with fibrous dysplasia should be evaluated and treated for endocrine diseases associated with McCune–Albright syndrome. In particular untreated growth hormone excess may worsen craniofacial fibrous dysplasia and increase the risk of blindness.[23] Untreated hypophosphatemia increases bone pain and risk of fractures.[24]
^ abcBoyce, Alison M.; Collins, Michael T. (1993-01-01). Pagon, Roberta A.; Adam, Margaret P.; Ardinger, Holly H.; Wallace, Stephanie E.; Amemiya, Anne; Bean, Lora J.H.; Bird, Thomas D.; Fong, Chin-To; Mefford, Heather C. (eds.). Fibrous Dysplasia/McCune-Albright Syndrome. Seattle (WA): University of Washington, Seattle. PMID25719192.
^Cole DE; Fraser FC; Glorieux FH; Jequier S; Marie PJ; Reade TM; Scriver CR (14 Apr 1983). "Panostotic fibrous dysplasia: a congenital disorder of bone with unusual facial appearance, bone fragility, hyperphosphatasemia, and hypophosphatemia". American Journal of Medical Genetics. 14 (4) (4 ed.): 725–35. doi:10.1002/ajmg.1320140414. PMID6846403.
^Leslie WD; Reinhold C; Rosenthall L; Tau C; Glorieux FH (July 1992). "Panostotic fibrous dysplasia. A new craniotubular dysplasia". Clinical Nuclear Medicine. 17 (7) (7 ed.): 556–60. doi:10.1097/00003072-199207000-00005. PMID1638836. S2CID43035832.
^Cabral, C. E.; Guedes, P.; Fonseca, T.; Rezende, J. F.; Cruz Júnior, L. C.; Smith, J. (1998-05-01). "Polyostotic fibrous dysplasia associated with intramuscular myxomas: Mazabraud's syndrome". Skeletal Radiology. 27 (5): 278–282. doi:10.1007/s002560050381. ISSN0364-2348. PMID9638839. S2CID6558881.
^Cutler, Carolee M.; Lee, Janice S.; Butman, John A.; FitzGibbon, Edmond J.; Kelly, Marilyn H.; Brillante, Beth A.; Feuillan, Penelope; Robey, Pamela G.; DuFresne, Craig R. (2006-11-01). "Long-term outcome of optic nerve encasement and optic nerve decompression in patients with fibrous dysplasia: risk factors for blindness and safety of observation". Neurosurgery. 59 (5): 1011–1017, discussion 1017–1018. doi:10.1227/01.NEU.0000254440.02736.E3. ISSN1524-4040. PMID17143235. S2CID19550908.
^Leet, Arabella I.; Magur, Edward; Lee, Janice S.; Wientroub, Shlomo; Robey, Pamela G.; Collins, Michael T. (2004-03-01). "Fibrous dysplasia in the spine: prevalence of lesions and association with scoliosis". The Journal of Bone and Joint Surgery. American Volume. 86-A (3): 531–537. doi:10.2106/00004623-200403000-00011. ISSN0021-9355. PMID14996879.
^Leet, Arabella I.; Magur, Edward; Lee, Janice S.; Wientroub, Shlomo; Robey, Pamela G.; Collins, Michael T. (2004-03-01). "Fibrous dysplasia in the spine: prevalence of lesions and association with scoliosis". The Journal of Bone and Joint Surgery. American Volume. 86-A (3): 531–537. doi:10.2106/00004623-200403000-00011. ISSN0021-9355. PMID14996879.
