Osteitis fibrosa cystica

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Osteitis fibrosa cystica
Classification and external resources
X-ray of a pair of human tibia, which run from the top right and left corner of the image into the bottom center, where they almost converge. Small gray blemishes, identified as brown tumors, can be seen at the top and halfway down the right tibia and about three-quarters down the length of the left tibia.

Osteitis fibrosa cystica of the tibia. Arrows point to the brown tumors which are typically present in bones of people with OFC.
ICD-10 E21.0
ICD-9 252.01
OMIM 603233
DiseasesDB 30721
MedlinePlus 001252
MeSH D010002

Osteitis fibrosa cystica /ˌɒstiːˈaɪtɨs faɪˈbroʊsə ˈsɪstɨkə/,[1] abbreviated OFC, and also known as osteitis fibrosa, osteodystrophia fibrosa, Von Recklinghausen's Disease of Bone, not to be confused with Von Recklinghausen's disease (neurofibromatosis type I). Osteitis Fibrosa Cystica is a skeletal disorder caused by a surplus of parathyroid hormone from over-active parathyroid glands. This surplus stimulates the activity of osteoclasts, cells that break down bone, in a process known as osteoclastic bone resorption. The over-activity of the parathyroid glands (hyperparathyroidism) can be triggered by parathyroid adenoma, hereditary factors, parathyroid carcinoma, or renal osteodystrophy. Osteoclastic bone resorption releases minerals, including calcium, from the bone into the bloodstream. In addition to elevated blood calcium levels, over-activity of this process results in a loss of bone mass, a weakening of the bones as their calcified supporting structures are replaced with fibrous tissue (peritrabecular fibrosis), and the formation of cyst-like brown tumors in and around the bone. The symptoms of the disease are the consequences of both the general softening of the bones and the excess calcium in the blood, and include bone fractures, kidney stones, nausea, moth-eaten appearance in the bones, appetite loss, and weight loss.

First described in the nineteenth century, OFC is currently detected through a combination of blood testing, X-rays, and tissue sampling. Before 1950, around half of those diagnosed with hyperparathyroidism in the United States saw it progress to OFC, but with early identification techniques and improved treatment methods, instances of OFC in developed countries are increasingly rare. Where treatment is required, it normally involves addressing the underlying hyperparathyroidism before commencing long-term treatment for OFC—depending on its cause and severity, this can range from hydration and exercise to surgical intervention.

Classification

Osteitis fibrosa cystica is defined as the classic skeletal manifestation of advanced hyperparathyroidism. Under the ICD-10 classification system, established by the World Health Organization, OFC is listed under category E21.0, primary hyperparathyroidism.[2]

Signs and symptoms

The major symptoms of OFC are bone pain or tenderness, bone fractures, and skeletal deformities such as bowing of the bones. The underlying hyperparathyroidism may cause kidney stones, nausea, constipation, fatigue and weakness. X-rays may indicate thin bones, fractures, bowing, and cysts. Fractures are most commonly localized in the arms, legs, or spine.[3][4]

The addition of weight loss, appetite loss, vomiting, polyuria, and polydipsia to the aforementioned symptoms may indicate that OFC is the result of parathyroid carcinoma.[5] Parathyroid carcinoma, an uncommon cancer of the parathyroid glands, is generally indicated by serum calcium levels higher than usual, even in comparison to the high serum calcium levels that OFC generally presents with. Symptoms are also often more severe.[6] Generally, the presence of a palpable neck mass is also indicative of the cancer, occurring in approximately 50% of sufferers, but virtually nonexistent in individuals with OFC with a different origin.[7]

Causes

Diagram showing position of the parathyroid glands beside the thyroid

Osteitis fibrosa cystica is the result of unchecked hyperparathyroidism, or the overactivity of the parathyroid glands, which results in an overproduction of parathyroid hormone (PTH). PTH causes the release of calcium from the bones into the blood, and the reabsorption of calcium in the kidney. Thus, excess PTH in hyperparathyroidism causes elevated blood calcium levels, or hypercalcemia.[8] There are four major causes of primary hyperparathyroidism that result in OFC:

  • Parathyroid Adenoma

The vast majority of cases of hyperparathyroidism are the result of the random formation of benign, but metabolically active, parathyroid adenoma swellings. These instances comprise approximately 80–85% of all documented cases of hyperparathyroidism.[9]

  • Hereditary factors

Approximately 1 in 10 documented cases of hyperparathyroidism are a result of hereditary factors. Disorders such as familial hyperparathyroidism, multiple endocrine neoplasia type 1 (MEN Type 1) and hyperparathyroidism-jaw tumor syndrome can, if left unchecked, result in OFC.[9] MEN Type 1 is an autosomal dominant disorder and the most common hereditary form of hyperparathyroidism, affecting about 95% of genetic cases of OFC, and also tends to affect younger patients than other forms. Major mutations which can lead to hyperparathyroidism generally involve the parathyroid hormone receptor, G proteins, or adenylate cyclase.[10][11] Certain genetic mutations have been linked to a higher rate of parathyroid carcinoma occurrence, specifically mutations to the gene HRPT2, which codes for the protein parafibromin.[12]

  • Parathyroid carcinoma

Parathyroid carcinoma (cancer of the parathyroid gland) is the rarest cause of OFC, accounting for about 0.5% of all cases of hyperparathyroidism. OFC onset by parathyroid carcinoma is difficult to diagnose.[9]

  • Renal complications

OFC is a common presentation of renal osteodystrophy, which is a term used to refer to the skeletal complications of end stage renal disease (ESRD). OFC occurs in approximately 50% of patients with ESRD.[13] ESRD occurs when the kidneys fail to produce calcitriol, a form of Vitamin D, which assists in the absorption of calcium into the bones. When calcitriol levels decrease, parathyroid hormone levels increase, halting the storage of calcium, and instead triggering its removal from the bones.[14]

Pathophysiology

The effects of OFC on bone are largely dependent on the duration of the disease and the level of parathyroid hormone (PTH) produced.[15] PTH is responsible for maintaining a homeostatic calcium concentration in the blood. It activates the parathyroid-hormone related protein receptor located on osteoblasts and osteocytes, both of which are responsible for the building and calcification of bone. Abnormalities affecting the parathyroid glands cause a surplus of PTH, which, in turn, increases the activity and frequency of osteoblasts and osteocytes.[16] Increased PTH levels trigger the release of stored calcium through the dissolution of old bone, as well as the conservation of serum calcium through a cessation in the production of new bone.[17][18]

Generally, the first bones to be affected are the fingers, facial bones, ribs, and pelvis.[19][20] Long bones, which are longer than they are wide, are also among the first affected.[20] As the disease progresses, any bone may be affected.[15]

X-ray of the hands showing brown tumors in the long bones of the fingers

Diagnosis

OFC may be diagnosed using a variety of techniques. Muscles in patients afflicted with OFC can either appear unaffected or "bulked up." If muscular symptoms appear upon the onset of hyperparathyroidism, they are generally sluggish contraction and relaxation of the muscles.[21] Deviation of the trachea (a condition in which the trachea shifts from its position at the midline of the neck), in conjunction with other known symptoms of OFC can point to a diagnosis of parathyroid carcinoma.[20]

Blood tests on patients with OFC generally show high levels of calcium (normal levels are considered to range between 8.5 and 10.2 mg/dL,[22] parathyroid hormone (levels generally above 250 pg/mL, as opposed to the "normal" upper-range value of 65 pg/mL[23]),[24] and alkaline phosphatase[3](normal range is 20 to 140 IU/L[25]).

X-rays may also be used to diagnose the disease. Usually, these X-rays will show extremely thin bones, which are often bowed or fractured. However, such symptoms are also associated with other bone diseases, such as osteopenia or osteoporosis.[26] Generally, the first bones to show symptoms via X-ray are the fingers.[19] Furthermore, brown tumors, especially when manifested on facial bones, can be misdiagnosed as cancerous.[26] Radiographs distinctly show bone resorption and X-rays of the skull may depict an image often described as "ground glass" or "salt and pepper".[27][28] Dental X-rays may also be abnormal.[3]

Histology of bone showing osteitis fibrosa cystica. (Fibrosis and intratrabecular tunnels are seen).

Cysts may be lined by osteoclasts and sometimes blood pigments, which lend to the notion of "brown tumors." Such cysts can be identified with nuclear imaging combined with specific tracers, such as sestamibi.[4] Identification of muscular degeneration or lack of reflex can occur through clinical testing of deep tendon reflexes, or via photomotogram (an achilles tendon reflex test).[21][29]

Fine needle aspiration (FNA) can be used to biopsy bone lesions, once found on an X-ray or other scan. Such tests can be vital in diagnosis and can also prevent unnecessary treatment and invasive surgery.[30] Conversely, FNA biopsy of tumors of the parathyroid gland is not recommended for diagnosing parathyroid carcinoma and may in fact be harmful, as the needle can puncture the tumor, leading to dissemination and the possible spread of cancerous cells.[31]

The brown tumors commonly associated with OFC display many of the same characteristics of osteoclasts.[20] These cells are characteristically benign, feature a dense, granular cytoplasm, and a nucleus that tends to be ovular in shape, enclosing comparatively fine chromatin. Nucleoli also tend to be smaller than average.[15]

Comparison of bone pathology
Condition 		Calcium Phosphate Alkaline phosphatase Parathyroid hormone Comments
Osteoporosis unaffected unaffected normal unaffected decreased bone mass
Osteopetrosis unaffected unaffected elevated unaffected thick dense bones also known as marble bone
Osteomalacia and rickets decreased decreased elevated elevated soft bones
Osteitis fibrosa cystica elevated decreased elevated elevated brown tumors
Paget's disease of bone unaffected unaffected variable (depending on stage of disease) unaffected abnormal bone architecture

Management

Medical

Medical management of OFC consists of Vitamin D treatment, generally alfacalcidol or calcitriol, delivered intravenously. Studies have shown that in cases of OFC caused by either end-stage renal disease or primary hyperparathyoidism, this method is successful not only in treating underlying hyperparathyoidism, but also in causing the regression of brown tumors and other symptoms of OFC.[32]

Surgery

In especially severe cases of OFC, parathyroidectomy, or the full removal of the parathyroid glands, is the chosen route of treatment. Parathyroidectomy has been shown to result in the reversal of bone resorption and the complete regression of brown tumors.[32] In situations where parathyroid carcinoma is present, surgery to remove the tumors has also led to the regression of hyperparathyroidism as well as the symptoms of OFC.[33]

Bone transplants have proven successful in filling the lesions caused by OFC. A report showed that in 8 out of 11 instances where cavities caused by OFC were filled with transplanted bone, the lesion healed and the transplanted bone blended rapidly and seamlessly with the original bone.[34]

Prognosis

Almost all who undergo parathyroidectomy experience increased bone density and repair of the skeleton within weeks. Additionally, patients with OFC who have undergone parathyroidectomy begin to show regression of brown tumors within six months.[35][36] Following parathyroidectomy, hypocalcaemia is common. This results from a combination of suppressed parathyroid glands due to prolonged hypercalcaemia, as well as the need for calcium and phosphate in the mineralization of new bone.[37]

Thirty percent of patients with OFC caused by parathyroid carcinoma who undergo surgery see a local recurrence of symptoms. The post-surgical survival rate hovers around seven years, while patients who do not undergo surgery have a survival rate of around five years.[20]

Epidemiology

Osteitis fibrosa cystica has long been a rare disease.[38] Today, it appears in only 2% of individuals diagnosed with primary hyperparathyroidism, which accounts for 90% of instances of the disease.[20] Primary hyperparathyroidism is three times as common in individuals with diabetes mellitus.[39]

The hospitalization rate for hyperparathyroidism in the United States in 1999 was 8.0 out of 100,000.[40] The disease has a definite tendency to affect younger individuals, typically appearing before the age of 40, with a study in 1922 reporting that 70% of cases display symptoms before the age of 20, and 85% before 35.[41] Primary hyperparathyoidism, as well as OFC, is more common in Asiatic countries.[19] Before treatment for hyperparathyroidism improved in the 1950s, half of those diagnosed with hyperparathyroidism saw it progress into OFC.[3]

Rates of OFC increase alongside cases of unchecked primary hyperparathyroidism. In developing countries, such as India, rates of disease as well as case reports often mirror those published in past decades in the developed world.[42][43]

The other 10% of cases are primarily caused by primary hyperplasia, or an increase of the number of cells. Parathyroid carcinoma accounts for less than 1% of all cases,[20] occurring most frequently in individuals around 50 years of age (in stark contrast to OFC as a result of primary hyperparathyroidism) and showing no gender preference.[20] Approximately 95% of hyperparatyhroidism caused by genetic factors is attributed to MEN type 1. This mutation also tends to affect younger individuals.[9]

History

Friedrich Daniel von Recklinghausen, who is creited, along with Gerhard Engel, in naming OFC

The condition was first described by Gerhard Engel in 1864 and Friedrich Daniel von Recklinghausen in 1890, though William Hunter, who died in 1783, is credited with finding the first example of the disease.[44][45] "von Recklinghausen's disease" (without the qualification "of bone") is a completely unrelated disorder, nowadays termed neurofibromatosis.[8] In 1884, Davies Colley delivered a presentation to the Pathological Society of London that detailed the manifestation of hyperparathyroidism into a brown tumor of the mandible, as well as the histological makeup of the tumor.[46]

The discovery and subsequent description of the parathyroid glands is credited to Ivar Sandstrom, though his publication, On a New Gland in Man and Several Mammals-Glandulae Parathyroideae, received little attention. Gustaf Retzius and Eugene Gley compounded his research, the latter credited with the discovery of the function of the parathyroid glands.[46] This research cumulated in the first surgical removal of a parathyroid tumor by Felix Mandel in 1925. A 2.5 × 1.5-inch (64 × 38 mm) tumor was removed from the thyroid artery of a man suffering from advanced OFC. The patient's symptoms disappeared, only to return in approximately six years as a result of renal stones that were diagnosed only after the patient had died. In 1932, blood tests on a female patient suffering from renal stone-based OFC revealed extremely high blood calcium levels. Fuller Albright diagnosed and treated the woman, who suffered from a large tumor of the neck as well as renal stones.[8]

The first published literature to describe a brown tumor (which was linked to OFC) was published in 1953, though clinical reports from before 1953 do draw a correlation between the disease and tumors previous to the publication.[47]

The advent of the multichannel autoanalyzer in the 1960s and 70s led to an increase in early diagnosis of primary hyperparathyroidism. This increase led to a sharp decline in the prolonged manifestation of the disease, leading to a drop in the number of cases of OFC due to the early detection of hyperparathyroidism.[48] Before this invention, the diagnosis of primary hyperparathyroidism was generally prolonged until the emergence of severe manifestations, such as OFC.[49]

References

  1. ↑ US dict: ŏs′·tē·īt′·əs fī·brō′·sə sĭs′·tə·kə
  2. ↑ "Chapter 4: Endocrine, nutritional, and metabolic diseases.". World Health Organization. WHO. 2006-12-11. Retrieved 2009-03-21. 
  3. ↑ 3.0 3.1 3.2 3.3 "Osteitis fibrosa". MedlinePlus (U.S. National Library of Medicine). 2008-09-25. Retrieved 2008-10-04. 
  4. ↑ 4.0 4.1 Rubin, M. R. (2001). "Tc99m-Sestamibi Uptake in Osteitis Fibrosa Cystica Simulating Metastatic Bone Disease". Journal of Clinical Endocrinology & Metabolism 86 (11): 5138–41. doi:10.1210/jc.86.11.5138. 
  5. ↑ Hundahl, SA; Fleming, ID; Fremgen, AM; Menck, HR (Aug 1, 1999). "Two hundred eighty-six cases of parathyroid carcinoma treated in the U.S. between 1985-1995: a National Cancer Data Base Report. The American College of Surgeons Commission on Cancer and the American Cancer Society.". Cancer 86 (3): 538–44. doi:10.1002/(SICI)1097-0142(19990801)86:3<538::AID-CNCR25>3.0.CO;2-K. PMID 10430265. 
  6. ↑ McCance, DR; Kenny, BD; Sloan, JM; Russell, CF; Hadden, DR (1987). "Parathyroid carcinoma: A review". Journal of the Royal Society of Medicine 80 (8): 505–9. PMC 1290959. PMID 3309302. 
  7. ↑ Quade, Gustav (2008-01-03). "Parathyroid Cancer Treatment". German National Cancer Institute. Retrieved 2008-12-10. 
  8. ↑ 8.0 8.1 8.2 Ellis 2002, p. 210
  9. ↑ 9.0 9.1 9.2 9.3 Kearns, A. E.; Thompson, G. B. (2002). "Medical and Surgical Management of Hyperparathyroidism". Mayo Clinic Proceedings 77 (1): 87–91. doi:10.4065/77.1.87. PMID 11794462. 
  10. ↑ Eubanks, P. J.; Stabile, BE (1998). "Osteitis Fibrosa Cystica with Renal Parathyroid Hormone Resistance: A Review of Pseudohypoparathyroidism with Insight into Calcium Homeostasis". Archives of Surgery 133 (6): 673–6. doi:10.1001/archsurg.133.6.673. PMID 9637471. 
  11. ↑ Guru, S. C. (1998). "Menin, the product of the MEN1 gene, is a nuclear protein". Proceedings of the National Academy of Sciences 95 (4): 1630–4. doi:10.1073/pnas.95.4.1630. PMC 19125. PMID 9465067. 
  12. ↑ Lawrence, Kim (2006-06-05). "Parathyroid Carcinoma". EMedicine. Retrieved 2009-01-07. 
  13. ↑ Mourelatos, Zissimos; Herbert Goldberg, Grant Sinson, Dianna Quan, Ehud Lavi (2005-07-03). "Final Diagnosis – Brown Tumor (Giant Cell Tumor of Hyperparathyroidism)". University of Pittsburgh School of Medicine. Retrieved 2008-11-17. 
  14. ↑ Delmez, James (January 2005). "Renal Osteodystrophy". National Institute of Health (U.S. Department of Health and Human Services). Retrieved 2009-04-06. 
  15. ↑ 15.0 15.1 15.2 Watson, Carolyn W.; Unger, Pamela; Kaneko, Mamoru; Gabrilove, Jacques L. (1985). "Fine needle aspiration of osteitis fibrosa cystica". Diagnostic Cytopathology 1 (2): 157–60. doi:10.1002/dc.2840010212. PMID 3836078. 
  16. ↑ Wesseling, Katherine; Bakkaloglu, Sevcan; Salusky, Isidro (2007). "Chronic kidney disease mineral and bone disorder in children". Pediatric Nephrology 23 (2): 195–207. doi:10.1007/s00467-007-0671-3. PMC 2668632. PMID 18046581. 
  17. ↑ Campbell 1987, p. 895
  18. ↑ Patton 1996, pp. 559–61
  19. ↑ 19.0 19.1 19.2 Salerno, G.; Gilbert, J.; Sharif, H. (2002). "Bilateral knee pain with hyperparathyroidism". JRSM 95 (3): 134–6. doi:10.1258/jrsm.95.3.134. PMC 1279482. PMID 11872764. 
  20. ↑ 20.0 20.1 20.2 20.3 20.4 20.5 20.6 20.7 Gupta, Anju; Horattas, Mark C.; Moattari, Ali Reza; Shorten, Scott D. (October 2001). "Disseminated Brown Tumors from Hyperparathyroidism Masquerading as Metastatic Cancer: A Complication of Parathyroid Carcinoma". The American Surgeon 67 (10): 951–5. PMID 11603552. Retrieved 2009-02-26. 
  21. ↑ 21.0 21.1 Eberstein 1983, p. 164
  22. ↑ "Serum calcium". MedlinePlus (U.S. National Library of Medicine). 2007-10-30. Retrieved 2009-10-27. 
  23. ↑ Aloia, JF; Feuerman, M; Yeh, JK (2006). "Reference range for serum parathyroid hormone". Endocrine practice 12 (2): 137–44. PMC 1482827. PMID 16690460. 
  24. ↑ Hricik 2003, p. 323
  25. ↑ "ALP isoenzyme test". MedlinePlus (U.S. National Library of Medicine). 2009-05-07. Retrieved 2009-10-26. 
  26. ↑ 26.0 26.1 Reséndiz-Colosia, Jaime Alonso; Rodríguez-Cuevas, Sergio Arturo; Flores-Díaz, Rutilio; Juan, Martín Hernández-San; Gallegos-Hernández, José Francisco; Barroso-Bravo, Sinhué; Gómez-Acosta, Fernando (2008). "Evolution of maxillofacial brown tumors after parathyroidectomy in primary hyperparathyroidism". Head & Neck 30 (11): 1497–504. doi:10.1002/hed.20905. 
  27. ↑ "Association of Level Oo GFR with Bone Disease And Disorders of Calcium And Phosphorus Metabolism". NKF K/DOQI Guidelines. National Kidney Foundation. 2002. Retrieved 2008-11-17. 
  28. ↑ Hurd, Robert (2006-08-11). "Osteitis fibrosa". UCLA Health (UCLA). Retrieved 2008-10-22. 
  29. ↑ "Photomotogram (achilles reflex test)". The Western journal of medicine 127 (2): 177. 1977. PMC 1237752. PMID 18748025. 
  30. ↑ Kemp, Anna M. Collins; Bukvic, Meliha; Sturgis, Charles D. (2008). "Fine Needle Aspiration Diagnosis of Osteitis Fibrosa Cystica (Brown Tumor of Bone)". Acta Cytologica 52 (4): 471–4. doi:10.1159/000325556. PMID 18702368. 
  31. ↑ Kim, Lawrence (2006-06-05). "Parathyroid Carcinoma: Differential Diagnoses & Workup". eMedicine. Retrieved 2009-01-28. 
  32. ↑ 32.0 32.1 Arabi, A. (2006). "Regression of Skeletal Manifestations of Hyperparathyroidism with Oral Vitamin D". Journal of Clinical Endocrinology & Metabolism 91 (7): 2480–3. doi:10.1210/jc.2005-2518. 
  33. ↑ Ellis, H. A.; Floyd, M.; Herbert, F. K. (1971). "Recurrent hyperparathyroidism due to parathyroid carcinoma". Journal of Clinical Pathology 24 (7): 596–604. doi:10.1136/jcp.24.7.596. PMC 477103. PMID 4107487. 
  34. ↑ Brand, Richard A. (2008). "Follow-Up Study of the Use of Refrigerated Homogenous Bone Transplants in Orthopaedic Operations". Clinical Orthopaedics and Related Research 466 (1): 22–36. doi:10.1007/s11999-007-0030-5. PMC 2505281. PMID 18196370. 
  35. ↑ Silverberg, Shonni J.; Shane, Elizabeth; Jacobs, Thomas P.; Siris, Ethel; Bilezikian, John P. (1999). "A 10-Year Prospective Study of Primary Hyperparathyroidism with or without Parathyroid Surgery". New England Journal of Medicine 341 (17): 1249–55. doi:10.1056/NEJM199910213411701. PMID 10528034. 
  36. ↑ Agarwal, Gaurav; Mishra, Saroj K; Kar, Dilip K; Singh, Anil K; Arya, Vivek; Gupta, Sushil K; Mithal, Ambrish (2002). "Recovery pattern of patients with osteitis fibrosa cystica in primary hyperparathyroidism after successful parathyroidectomy". Surgery 132 (6): 1075–85. doi:10.1067/msy.2002.128484. 
  37. ↑ Gibbs, C. J.; Millar, J. G.; Smith, J. (1996). "Spontaneous healing of osteitis fibrosa cystica in primary hyperparathyroidism". Postgraduate Medical Journal 72 (854): 754–7. doi:10.1136/pgmj.72.854.754. PMC 2398661. PMID 9015472. 
  38. ↑ Coley, Bradley L.; Higibotham, Norman L. (1934). "Solitary Bone Cyst". Annals of Surgery 99 (3): 432–48. doi:10.1097/00000658-193403000-00003. PMC 1390041. PMID 17867151. 
  39. ↑ Gulcelik, Nese Ersoz; Bozkurt, Fani; Tezel, Gaye Güler; Kaynaroglu, Volkan; Erbas, Tomris (2008). "Normal parathyroid hormone levels in a diabetic patient with parathyroid adenoma". Endocrine 35 (2): 147–50. doi:10.1007/s12020-008-9135-1. PMID 19116787. 
  40. ↑ Melton Lj, 3rd (2002). "The epidemiology of primary hyperparathyroidism in North America". Journal of bone and mineral research. 17 Suppl 2: N12–7. PMID 12412772. 
  41. ↑ Stevens 1922, p. 881
  42. ↑ Mishra, S. K.; Agarwal, G.; Kar, D. K.; Gupta, S. K.; Mithal, A.; Rastad, J. (2001). "Unique clinical characteristics of primary hyperparathyroidism in India". British Journal of Surgery 88 (5): 708–14. doi:10.1046/j.0007-1323.2001.01775.x. PMID 11350446. 
  43. ↑ Agarwal, Gaurav; Mishra, Saroj K; Kar, Dilip K; Singh, Anil K; Arya, Vivek; Gupta, Sushil K; Mithal, Ambrish (2002). "Recovery pattern of patients with osteitis fibrosa cystica in primary hyperparathyroidism after successful parathyroidectomy". Surgery 132 (6): 1075–83; discussion 1083–5. doi:10.1067/msy.2002.128484. 
  44. ↑ Buchanan, W. W. (2003). "William Hunter (1718-1783)". Rheumatology 42 (10): 1260–1261. doi:10.1093/rheumatology/keg003. PMID 14508042. 
  45. ↑ Buchanan, WW; Kraag, GR; Palmer, DG; Cockshott, WP (1981). "The first recorded case of osteitis fibrosa cystica". Canadian Medical Association journal 124 (6): 812–5. PMC 1705307. PMID 7471024. 
  46. ↑ 46.0 46.1 Rowlands, BC (1972). "Hyperparathyroidism: An early historical survey". Annals of the Royal College of Surgeons of England 51 (2): 81–90. PMC 2388184. PMID 5077791. 
  47. ↑ Campuzano-Zuluaga, Germán; Velasco-Pérez, William; Marín-Zuluaga, Juan Ignacio (2009). "A 60-year-old man with chronic renal failure and a costal mass: A case report and review of the literature". Journal of Medical Case Reports 3: 7285. doi:10.4076/1752-1947-3-7285. PMC 2737768. PMID 19830164. 
  48. ↑ Levine 2001, p. 350
  49. ↑ Levine 2001, p. 403

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Osteochondropathy (M80–M94, 730–733)
Osteopathies
Osteitis
endocrine bone disease:
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Bone density
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Continuity of bone
Other
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