An aggressive form of odontogenic cyst known as the keratocyst has been reviewed with a report on the findings of 70 new instances. Recurrence after 2 years of followup was found to be 20%. From both a review of the literature and original cases, carcinomatous and ameloblastomatous transformation in odontogenic keratocysts seems to be an extremely rare phenomenon. Alternatively, epidermoid carcinoma and mucoepidermoid carcinoma arising centrally within the jaws are often associated with other types of dental cysts. Review of 36 instances of central epidermoid carcinoma has disclosed that 75% were associated with a cyst lining; the 2‐year survival rate was found to be 53%. Central mucoepidermoid carcinoma was associated with a dental cyst or impacted tooth in 48% of the cases, and enjoyed a 100% 2‐year and 5‐year survival; however, 2 patients were recorded alive with disease at 4 months and 10 years, whereas another patient succumbed to disease 14 years post‐operatively.
4hxtract. A tolal of 841 reviewed cases and 75 reported cases ol' fibro-osseous lesions of the jaws, excluding (he giant cell group, are analyzed willi regard lo elinical. radiographic, and hislologic features. Precise criteria for Ihe differential diagnosis of fibrous dysplasia, ossifying fibroma, gigantiform cemenloma, chronie diffuse selerosing osteomyelitis, foeal sclerosing osteomyelitis, and periapical cementoma have been ptese/ited with emphasis on radiographic and behavioral features.
Reports of gingival peripheral ameloblastoma are extremely rare and have been sporadic. This paper reports a pertinent case of a 40-year-old woman who for 2 years had a progressively enlarging asymptomatic firm mass in the buccal gingival region of the lower premolars. Cupping of the underlying bone was radiographically demonstrated. The lesion was excised surgically together with extraction of the first premolar, and no evidence of recurrence was seen 5 years later. The clinical, radiological, and histopathological characteristics of gingival peripheral ameloblastoma were analyzed in the 33 previously reported cases. The differential diagnosis and treatment of this case report are discussed.
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