Cases reported "Ameloblastoma"

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1/113. A unique case of desmoplastic ameloblastoma of the mandible: report of a case and brief review of the English language literature.

    A unique case of desmoplastic ameloblastoma is reported from the clinical, radiographic, and histologic viewpoints. The patient was a 56-year-old man who complained of a painless swelling on the buccal aspect of the left mandible. Periapical and panoramic radiographs revealed a rounded, slightly radiolucent area with blurred osteosclerotic margins. Occlusal radiograph and computed tomography images disclosed buccal bone expansion outlined by thinned cortices. Computed tomography images exhibited an enhanced area in the anterior portion of the lesion. Interestingly, the coronal computed tomography images revealed a close relationship between the periodontal membrane of the left mandibular second premolar and the enhanced area. biopsy specimens from the anterior portion of the lesion displayed typical histologic features of the desmoplastic variant of ameloblastoma. However, those from the posterior portion disclosed a large cystic formation. Oxytalan fibers were identified in the stromal tissue of the tumor, which suggested that the tumor arose from the epithelial rests of Malassez in the periodontal membrane of the related tooth. We also reviewed previously reported 41 cases. In 36 of 38 cases in which the location was specified, the tumor was found in the anterior to premolar region of the maxilla or mandible. A radiographic description was given in only 29 previous cases, 28 of which involved multilocular lesions. No cyst as large as the one in the present case was found among the previously reported desmoplastic ameloblastomas. Although the present case deviates from the usual desmoplastic variant of ameloblastoma in terms of locus, radiologic appearance, and cyst formation, it still meets the histologic criteria for this variant in both the stromal and epithelial components.
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2/113. ameloblastoma of the maxilla. Case report.

    A basal cell maxillary ameloblastoma became obvious as an asymptomatic swelling of the left buccal sulcus and alveolar process, although a large extension into the maxillary sinus up to the nasal conchae and the orbital floor had already occurred. The painless and slow growth of the lesion, the thin bone of the upper jaws, the adjacent cavities and the vital structures are the main factors for delay in recognition and thus the potentially lethal result of a maxillary ameloblastoma. A review of location, age, sex and race predilection, clinical course, radiographic appearance, histological types and treatment methods in made.
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3/113. So-called 'hybrid' lesion of desmoplastic and conventional ameloblastoma: report of a case and review of the literature.

    So-called 'hybrid' lesion of ameloblastoma, which is composed of desmoplastic ameloblastoma and conventional follicular/plexiform ameloblastoma, is an unusual variant of ameloblastoma and only eight cases of 'hybrid' lesion have been published in the English literature. To enhance knowledge of this interesting tumor, we add a case of 'hybrid' lesion that occurred in the right mandible of a 48-year-old Japanese male. Radiographic examination disclosed a honeycomb appearance at the anterior alveolar region, combined with a unicystic radiolucency in the molar region of the mandibular body. Histologically, the former showed microscopic features of desmoplastic ameloblastoma and the latter those of follicular ameloblastoma with focal granular cell transformation. The lesion was enucleated with curettage of surrounding bone and the lesional cavity was marsupialized. Although tumor tissues reappeared at 3, 5, 7 and 14 months after the surgery, the patient has remained disease free for 11 years after the last vaporization by CO2 laser of the recurred tumor. Many more cases of 'hybrid' lesion are needed to clarify the clinicopathological, histopathological and biological characteristics of this interesting variant of ameloblastoma.
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4/113. Intraosseous squamous cell carcinoma arising in association with a squamous odontogenic tumour of the mandible.

    We report a rare occurrence of intraosseous squamous cell carcinoma (SCC) arising in association with a squamous odontogenic tumour (SOT), which had not previously been documented in the literature. A 53-year-old man had, for 5 years, a well-demarcated radiolucency attached to the impacted third molar of the mandible. The enucleated specimen had a characteristic pattern of SOT, but in which a few epithelial islands showed atypical features suggestive of SCC. Intense p53-, proliferating cell nuclear antigen- and Ki-67-positive cells were detected in carcinoma areas. Within 2 months, aggressive bone destruction showing typical findings of intraosseous SCC appeared. The present tumour is presumably a malignant variant of SOT.
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5/113. A simple prosthetic approach using cement-retained implant prosthesis after surgical treatment of ameloblastoma.

    ameloblastoma is an odontogenic tumor of epithelial origin that manifests itself in the maxillofacial area with marked deformity. After removal of the tumor, prosthetic reconstruction may be challenging because of extensive tissue loss, which necessitates careful treatment planning. We describe a case in which a patient lost considerable supporting tissue after excision of the tumor. The mandible was grafted with autogenous corticocancellous bone harvested from the left anterior iliac crest in a delayed manner. After healing, six implants were placed. After second-stage surgery, a new method was used to reduce thickness of the soft tissue around the implants. A cement-retained nine-unit fixed partial denture was fabricated in three clinical visits. The patient has been monitored for 5 years with no complications despite the use of cement to retain the prosthesis and the unfavorable crown-to-root ratio.
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6/113. Peripheral ameloblastoma: a report of 2 cases.

    Peripheral ameloblastoma (PA) is a rare odontogenic tumor most common in elderly patients. They are usually solitary; red or pink granular, nodular, or papillary lesions; up to 1.5 cm in diameter; and either not resorb bone or produce a shallow erosion. Peripheral ameloblastoma should be included in the differential diagnosis of soft tissue lumps on the gingiva or edentulous alveolus.
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7/113. Ameloblastic carcinoma ex ameloblastoma of the mandible with malignancy-associated hypercalcemia.

    ameloblastoma is a rare, locally destructive, benign neoplasm of the jawbones, which arises from epithelium derived from the epithelial components of the developing tooth. Ameloblastic carcinoma is the term used to designate any ameloblastoma in which there is histologic evidence of malignancy in the primary tumor, regardless of whether it has metastasized. Most ameloblastic carcinomas are presumed to have arisen de novo, with few cases of malignant transformation of ameloblastoma being apparent. hypercalcemia is the most common metabolic complication of malignancy. Although malignancy-associated hypercalcemia is often reported in association with other malignancies, it is exceedingly unusual in association with ameloblastoma, malignant ameloblastoma, or ameloblastic carcinoma. We describe a patient with multiple recurrences of ameloblastoma, with subsequent malignant transformation presenting with malignancy-associated hypercalcemia.
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8/113. Extra copies of chromosomes 7, 8, 12, 19, and 21 are recurrent in adamantinoma.

    adamantinoma of long bones is a rare neoplasm predominantly involving the tibia. Cytogenetic studies of adamantinoma are few. Cytogenetic or molecular cytogenetic analysis of four adamantinomas, and a review of eleven cases in the literature reveals extra copies of chromosomes 7, 8, 12, 19, and 21 as recurrent in this neoplasm. adamantinoma may be confused with a variety of primary and metastatic epithelial and mesenchymal neoplasms. observation of these aneuploidies may be useful in establishing the diagnosis of adamantinoma.
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9/113. Diagnostic efficacy of three-dimensional images by helical CT for lesions in the maxillofacial region.

    The purpose of this study was to evaluate the efficacy of three-dimensional (3-D) images produced with a helical CT for the diagnosis of lesions occurring in the maxillofacial region. Thirty-four patients, who had lesions in the maxillofacial region, were examined by plain radiography (intra and extraoral) and the helical CT. Further, 3-D images were reconstructed from the data provided by the helical CT using the volume rendering method. These images were compared with plain radiographic images and conventional two-dimensional (2-D) CT images in terms of the information they provided for diagnosis. Using the 3-D images for tumors, bone destruction, inner components, extent of the lesion,the relationship between the lesion and surrounding anatomical landmarks, and the roots of the adjacent teeth were observed in overall views. We conclude that 3-D images produced by helical CT may provide useful information for the diagnosis of lesions.
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10/113. Successful mandibular reconstruction using a BMP bioimplant.

    A bone morphogenetic protein bioimplant was used for primary reconstruction of a 6-cm mandibular discontinuity defect, after a segmental resection of an ameloblastoma. Radiographic evidence of new bone induction was seen at 3 and 9 months, postoperatively. A biopsy was taken at 9 months demonstrated viable new bone formation at the bioimplant site. This is the first reported case using a bone morphogenetic protein bioimplant in a human, followed by histological confirmation of new bone.
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