Odontogenic tumors II


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Oral & Maxillofacial Surgery
Fifth Year

Published in: Health & Medicine, Technology

Odontogenic tumors II

  1. 1. Dr. Adel I. Abdelhady BDS, MSC, (Egypt) PhD. (Egypt, USA) Oral and Maxillofacial Surgery Dept. College of Dentistry, Dammam University, KSA
  2. 2.  By the end of the lecture(s) Students should display a      knowledge, information and understanding of : 1.Classification the odontogenic tumors 2.familiar with the different types of odontogenic tumor according to its origin 3.Examine and diagnose patient’s complain from facial swelling 4. Establish a Differential Diagnosis of the mandibular as will as maxillary swelling 5. Differentiate between different types of tumor’s biological behaviors and accordingly select the suitable management technique (s)
  3. 3. Cementoblastoma  This tumor typically occurs around the roots of the lower posterior teeth.  Like virtually all odontogenic tumors, it is benign but it expands the jaw, causes pain and requires surgical removal. Radiographically it appears as a ball of dense material attached to the end of the root
  4. 4. (Central) Odontogenic Fibroma Clinical Features  Fewer than 50 cases have been reported in the English literature.  Patient Age: Patients have ranged in age from 980 years old with a mean of 40 years.  Gender Predilection: Females, 7.4 : 1 in one study.  Location: 60% Sixty percent occur in the maxilla where most are located anterior to the first molar. When in the mandible, approximately 50 % occur in the posterior jaw.
  5. 5. Odontogenic Fibroma: Radiographic Appearance  The odontogenic fibroma usually appears as a well- defined, unilocular radiolucency. It is often associated with the apical area of an erupted tooth.  Larger lesions are often multilocular.  Many odontogenic fibromas have sclerotic borders. root resorption is common.
  6. 6. Odontogenic Fibroma: Additional Features  Small odontogenic fibromas are usually asymptomatic.  The larger lesions may be associated with localized bony expansion of the jaw or with the loosening of adjacent teeth.
  7. 7. Odontogenic Fibroma: Histologic Features  Some authors have described two separate types of odontogenic fibromas.  The simple odontogenic fibroma is composed of stellate fibroblasts arranged in a whorled pattern with fine collagen fibrils and a lot of ground substance.  Foci of odontogenic epithelium may or may not be present.  Occasionally, foci of dystrophic calcification may be present.
  8. 8. Odontogenic Fibroma: Histological Features  The WHO type odontogenic fibroma appears as a fairly cellular fibrous connective tissue with collagen fibers arranged in interlacing bundles.  Odontogenic epithelium in the form of long strands or isolated nests is present throughout the lesion.  Calcifications composed of cementoid and/or dentinoid may be present.
  9. 9. Odontogenic Fibroma: Treatment and Prognosis  The odontogenic fibroma is usually treated by enucleation and curettage.  There have been few recurrences, this the prognosis is good.
  10. 10. Mixed Odontogenic Tumors  Ameloblastic fibroma, ameloblastic fibrodentinoma,     ameloblastic fibro-odontoma, odontoma Both epithelial and mesenchymal cells Mimic differentiation of developing tooth Treatment – enucleation, thorough curettage with extraction of impacted tooth Ameloblastic fibrosarcomas – malignant, treat with aggressive en bloc resection
  11. 11. Related Jaw Lesions  Giant Cell Lesions  Central giant cell  Fibroosseous lesions  Fibrous dysplasia granuloma  Ossifying fibroma  Brown tumor  Condensing Osteitis  Aneurysmal bone cyst
  12. 12. Central Giant Cell Granuloma  This is a neoplastic-like reactive proliferation of the jaws that accounts for less than 7% of all benign lesions of the jaws in tooth-bearing areas.  It commonly occurs in children and young adults with a slight female predilection.  The lesion is more common in the mandible than maxilla underlying anterior or premolar teeth. Expansile lesions can cause root divergence or resorption.
  13. 13. Central Giant Cell Granuloma  The clinical features:  Vary according to the type of development the lesion assumes. Lesions may be slow-growing and asymptomatic or rapidly expanding with pain, facial swelling and root resorption.  The fast growing variants have a high rate of recurrence.  Because of the higher incidence of these lesions among girls and women of child-bearing years, hormonal influences have been suggested as influential in their development.
  14. 14.  Intraosseous destructive lesions of the        jaws Far less common than peripheral giant cell granuloma 10-30 yrs of age; Female > Male Mandible > Maxilla; Ant. > Post. Mandibular lesions frequently cross the midline Asymptomatic or painless expansion Non-aggressive and aggressive lesions Perforation of the cortical plates and resorption of roots
  15. 15. Central Giant Cell Granuloma  Neoplastic -like reactive proliferation  Common in children and young adults  Males > Females (hormonal?)  Maxilla >Mandible  Expansile lesions – root resorption  Slow-growing – asymptomatic swelling  Rapid-growing – pain, loose dentition (high rate of recurrence)
  16. 16. Central Giant Cell Granuloma  Radiographic findings  Aggressive lesions show cortical perforation and root  resorption  Unilocular, multilocular radiolucencies  Well-defined or irregular borders  Histology  Multinucleated giant cells, dispersed throughout a fibrovascular stroma
  17. 17. Central Giant Cell Granuloma
  18. 18. Central Giant Cell Lesion CGCL  75% before the age of 30; female> male  Anterior mandible to first molar; can cross the midline  Non-aggressive vs aggressive:  Aggressive lesions: larger on presentation, painful, rapid growth, root resorption, cortical perforation, younger patients  Recurrence: 75% in aggressive lesions (11% in nonaggressive)  Questionable minor histological differences
  19. 19. Central Giant Cell Granuloma  Treatment  Curettage, segmental resection  Radiation – out of favor (risk of sarcoma)  Intralesional steroids – younger patients, very large lesions  Individualized treatment depending on characteristics and location of tumor
  20. 20. Brown tumors of hyperparathyroidism  Brown tumors are tumors of bone that arise in settings of excess osteoclast activity, such as hyperparathyroidism and consist of fibrous tissue, woven bone and supporting vasculature, but no matrix. They are radiolucent on x-ray. The osteoclasts consume the trabecular bone that osteoblasts lay down and this front of reparative bone deposition followed by additional resorption can expand beyond the usual shape of the bone, involving the periosteum thus causing bone pain. The characteristic brown coloration results from hemosiderin deposition into the osteolytic cysts. Also characteristic of giant cell tumors of the bone.
  21. 21.  Brown tumor, an uncommon focal giant-cell lesion, arises as a direct result of the effect of parathyroid hormone on bone tissue in patients with hyperparathyroidism  Laboratory evaluation revealed that the patient had primary hyperparathyroidism, parathyroid hormone level was 988 pg/ml (normal: 12 to 72).  Other laboratory measurements were total serum calcium, 11.2 mg/dl (normal: 8.8 to 11.0); phosphorus, 2.0 mg/dl (normal: 2.5 to 4.8); and alkaline phosphatase, 145 U/L (normal: 32 to 104).  Ultrasonography of the neck revealed an enlargement of the lower left parathyroid gland (2.1 x 1.4 x 0.8 cm). The finding of hyperparathyroidism confirmed the diagnosis of brown tumor.
  22. 22. Brown Tumor  Local manifestation of hyperparathyroidism  Histologically identical to CGCG  Serum calcium and phosphorus  More likely in older patients
  23. 23. Cherubism  Definition  Genetic disorder characterized by bilateral mandibular and maxillary intraosseous fibrous swellings in young individuals with autosomal dominant inheritance. Indistinguishable histologically from central giant cell granuloma  bilateral mandibular and maxillary involvement  young
  24. 24.  Histopathology  Large number of osteoclast-like, multinucleated giant cells  Indistinguishable microscopically from central giant cell granuloma  sometimes more delicate fibrovascular stroma without bone formation  Differential Diagnosis  Select up to 2 differential diagnoses to compare with Cherubism  Central Giant Cell Granuloma [Mandible and Maxilla]  Primary Hyperparathyroidism  Ossifying Fibroma
  25. 25. DD  Large number of osteoclast-like, multinucleated giant cells also in:  central giant cell granuloma  giant cell tumor (osteoclastoma)  fibro-osseous lesions  bone lesion of hyperparathyroidism  aneurysmal bone cyst
  26. 26. Fibrous Dysplasia  Monostotic vs. polystotic  Monostotic  More common in jaws and cranium  Polystotic  McCune-Albright’s syndrome  Cutaneous pigmentation, hyper-functioning endocrine glands, precocious puberty
  27. 27. Fibrous Dysplasia  Painless expansile dysplastic process of     osteoprogenitor connective tissue Site :Maxilla most common Does not typically cross midline (one bone) Antrum obliterated, orbital floor involvement (globe displacement) Radiology : ground-glass appearance
  28. 28. Fibrous dysplasia  Fibrous dysplasia is a condition in which normal  medullary bone is replaced by an abnormal fibrous  connective tissue proliferation in which new, nonmaturing bone is formed.  A genetic defect involving Gs-alpha proteins appears to underlie this process.
  29. 29. Etiology and Pathogenesis.  The nature of this condition has not been firmly established.  The name given to fibrous dysplasia was originally intended to indicate that the condition represented a dysplastic growth resulting from derange mesenchymal cell activity or a defect in the control of bone cell activity.  This genetic alteration may ultimately affect the proliferation and differentiation of fibroblasts/ osteoblasts that make up these lesions.
  30. 30. Clinical Features.  This disease most commonly  The most commonly presents as an asymptomatic, slow enlargement of the involved bone.  Fibrous dysplasia may involve a single bone or several bones concomitantly.  Monostotic fibrous dysplasia is the designation used to describe the process in one bone.  Polyostotic fibrous dysplasia applies to cases in which more than one bone is involved. McCune-Albright syndrome consists of polyostotic fibrous dysplasia, cutaneous melanotic pigmentations (cafe-aulait macules), and endocrine abnormalities. reported endocrine disorder consists of precocious sexual development in girls. Acromegaly, hyperthyroidism, hyperparathyroidism, and hyperprolactinemia have also been described
  31. 31.         Monostotic fibrous dysplasia is much more common than the polyostotic form, accounting for as many as 80% of cases. Jaw involvement is common in this form of the disease. Other bones that are commonly affected are the ribs and femur. Fibrous dysplasia occurs more often in the maxilla than in the mandible Maxillary lesions may extend to involve the maxillary sinus, zygoma , sphenoid bone, and floor of the orbit. This form of the disease, with involvement of several adjacent bones, has been referred to as craniofacial fibrous dysplasia. The most common site of occurrence with mandibular involvement is in the body portion.
  32. 32.  The slow, progressive enlargement of the affected jaw is usually painless and typically presents as a unilateral swelling.  As the lesion grows, facial asymmetry becomes evident and may be the initial presenting complaint.  The dental arch is generally maintained, although displacement of teeth, malocclusion, and interference with tooth eruption may occasionally occur.  Tooth mobility is not seen
  33. 33.  Age:  This condition characteristically has its onset during the first or second decade of life. Rarely, the lesion presents later in life, although this may only reflect the insidious, asymptomatic nature of fibrous dysplasia.  Gender :  Monostotic fibrous dysplasia generally exhibits an equal gender distribution, and the polyostotic form tends to occur more commonly in females.
  34. 34.  Fibrous dysplasia has available radiographic appearance  that ranges from a radiolucent lesion to a uniformly radiopaque mass  The classic lesion has been described as having a radiopaque change that imparts a "ground glass" effect  This characteristic image, which is most identifiable on intraoral radiographs, is not, however, pathognomonic.  Lesions of fibrous dysplasia may also present as unilocular or multilocular radiolucencies, especially in long bones.
  35. 35.  An important distinguishing feature of fibrous dysplasia is the poorly defined radiographic and clinical margins of the lesion. The process appears to blend into the surrounding normal bone without evidence of a circumscribed border.  Laboratory values for patients with monostotic fibrous dysplasia, specifically serum calcium, phosphorus, and alkaline phosphatase, are usually within normal  However, these serum chemistry markers may be altered in patients with McCune-Albright syndrome
  36. 36. Histopathology  Fibrous dysplasia consists of a slight to moderate cellular fibrous connective tissue stroma that contains foci of irregularly shaped trabcculae of immature bone  A relatively constant ratio of fibrous tissue to bone throughout a given lesion is characteristic.
  37. 37. Treatment and Prognosis  Deferred, if possible until skeletal maturity  Quarterly clinical and radiographic f/u  If quiescent – contour excision (cosmesis or function)  Accelerated growth or disabling functional impairment - surgical intervention
  38. 38. Treatment and Prognosis  After a variable period of pre-pubertal     growth, fibrous dysplasia characteristically stabilizes, although a slow advance may be noted into adulthood. Small lesions may therefore require no treatment other than biopsy confirmation and periodic follow-up. Large lesions that have caused cosmetic or functional deformity may be treated by surgical recontouring. This procedure is generally deferred until after stabilization of the disease process. En bloc resections for complete removal are impractical and unnecessary, because the lesions arc relatively large and poorly delineated.
  39. 39.  Malignant transformation is a rare complication of  fibrous dysplasia {fewer than 1% of cases) that has been described, usually in patients with the polyostotic type.  Many of the patients reported on were treated with radiation therapy, suggesting a role for radiation in the transformation process, although malignant change has been documented in the absence of radiation treatment.
  40. 40. Fibrous Dysplasia
  41. 41. Clinical Features  Age: Ossifying fibroma is an uncommon lesion that tends      to occur during the third and fourth decades of life Sex :in women more than men. It is a slow-growing, asymptomatic, and expansile lesion. In the head and neck, ossifying fibroma may be seen in the jaws and craniofacial bones. Site: Lesions of the jaws characteristically arise in the tooth-bearing regions, most often in the mandibular premolar-molar area The slow but persistent growth of the tumor may ultimately produce expansion and thinning of the buccal and lingual cortical plates, although perforation and mucosal ulceration are rare Most of these lesions are solitary
  42. 42.  Ossifying fibromas of the jaw are wellcircumscribed, slowly growing lesions. They are often mentioned in the same differential diagnosis as fibrous dysplasia, but it is important to make the distinction because the former lends itself to ready enucleation, while the latter can be admixed with surrounding tissues, making surgery more complicated.
  43. 43.  Patients generally present with a history of a painless expansion of a tooth-bearing portion of the mandible. Lesions of the maxilla are also encountered, but they are less common.  Radiographically, the lesions are typically 1 to 5 cm at their greatest dimension. Well-defined areas of osteolysis are noted radiographically, with varying degrees of calcification and cortical thinning.  These lesions can often be readily identified at the time of surgery by noting the case with which they can be separated from surrounding tissue.
  44. 44. radiographic features  The most important radiographic feature of this lesion is the wellcircumscribed, sharply defined border. Ossifying fibroma otherwise present a  variable appearance, depending on the density of  calcifications present.  Lesions may be relatively radiolucent because of evenly dispersed, calcified new bone.  Lesions may also appear as unilocular or multilocular radiolucencies that bear a resemblance to odontogenic lesions.  A mixed radiolucentradiopaque image is seen when islands of tumor bone are densely calcified.  The roots of teeth may be displaced and, less commonly tooth resorption is seen.
  45. 45.  A variant of ossifying fibroma, juvenile (aggressive) ossifying fibroma, has been described in children and young adults .Most affected individuals are younger than 15 years of age.  This lesion most commonly involves the paranasal sinuses and periorbital bones, where it may cause exophthalmoses, proptosis , sinusitis, and nasal symptoms.  This rare tumor behaves in a more aggressive fashion than does ossifying fibroma, and it may require more extensive surgery when encountered.  Microscopically, juvenile ossifying fibroma is highly cellular and contains trabeculae or spheroids of new bone.
  46. 46.  Cementifying fibroma, and cemento-ossifying fibroma, are terms occasionally used when the bony islands in these lesions have a round or spheroidal shape.  These tumors occur in similar age-groups and locations, exhibit comparable clinical characteristics, and have the same biologic behavior.  They are, for all practical purposes, the same lesion as ossifying fibroma.
  47. 47.  Other differential considerations are osteoblastoma, focal cementoosseous dysplasia, and focal osteomyelitis.  Osteoblastoma is evident in a slightly younger agegroup and is often characterized by pain. In addition, osseous trabeculae in these lesions are rimmed by abundant plump osteoblasts, and a central nidus may be evident.  Periapical cemento-osseous dysplasia in posterior teeth may appear radiographically similar and require a biopsy to separate it from ossifying fibroma.  Focal osteomyelitis is associated with a source of inflammation and is possibly accompanied by pain and swelling.
  48. 48. Treatment And Prognosis.  Treatment of ossifying fibroma : is most often accomplished by surgical removal using CURETTAGE OR ENUCLEATION.  The lesion can typically be separated easily from the surrounding normal bone.  Recurrence is described only rarely after removal.
  49. 49. Differential Diagnosis.  The primary differential consideration for fibrous dysplasia of the jaws is ossifying fibroma.  As previously noted, clinical, radiographic, and microscopic features must be considered together in order to distinguish these processes.  The well circumscribed ossifying fibroma as compared with the diffuse fibrous dysplasia often serves as the differentiating factor.
  50. 50.  Chronic osteomyelitis may occasionally mimic the radiographic appearance of fibrous dysplasia.  Inflammation, often mild, is present in osteomyelitis and may be accompanied by symptoms that include tenderness, pain, or drainage. The slowly progressive, asymptomatic nature of fibrous dysplasia usually allows differentiation from malignant tumors of bone.
  51. 51. Ossifying Fibroma  True neoplasm of medullary jaws  Elements of periodontal ligament  Younger patients, premolar – mandible  Frequently grow to expand jaw bone  Radiology  radiolucent lesion early, well-demarcated  Progressive calcification (radiopaque – 6 yrs)
  52. 52. Ossifying Fibroma
  53. 53.  Distinguishing between       Historically, differentiating ossifying fibroma and fibrous dysplasia is the primary diagnostic challenge. Both lesions may exhibit similar  clinical, radiographic, and microscopic features. The most helpful feature in distinguishing the two is the well circumscribed radiographic  appearance of ossifying fibroma and the ease with which it can be separated from normal bone. In most cases the well defined appearance of ossifying fibroma is evident radiographically. the two lesions was based primarily on histologic criteria. Fibrous dysplasia was reported to contain only woven bone, without evidence of osteoblastic rimming of bone. The presence of more mature lamellar bone was believed to be characteristic of ossifying fibroma
  54. 54. Types of Jaw Tumors and Primary Treatment Modalities