Argyrophilic nucleolar organizer regions (AgNORs) in ameloblastomas and adenomatoid odontogenic tumours (AOTs) / Regiões organizadora do nucléolo (AgNORs) argilofílicos em ameloblastomas e tumors odontogênicos adenomatóids

Twenty-two cases of ameloblastoma and ten cases of adenomatoid odontogenic tumour (AOT) were analyzed comparatively by the AgNOR technique. Ameloblastomas were distributed into three groups according to their clinical behaviour: primary lesions without recurrences (PLWTR), 5 cases; primary lesions with recurrences (PLWR), 4 cases; and recurrences, 13 cases. The cases were also regrouped according to their histological pattern: follicular (9 cases), plexiform (7 cases), acanthomatous (4 cases) and unicystic (2 cases). Considering histological patterns, there was a significant statiscal difference only between follicular and plexiform types. There were no significant differences between the group of ameloblastomas and the group of AOTs or between the three groups of ameloblastomas with different clinical behaviour. Our results strongly suggest that the distinct clinical behaviour of ameloblastomas and AOT is not correlated with their celular proliferation ratio. Thus, the infiltrative ability of the ameloblastomas is probably not related to the cellular proliferation index of these tumours

Clear-cell ameloblastoma: clear-cell odontogenic carcinoma: report of a case / Ameloblastoma de células claras: carcinoma odontogênico de células claras: relato de caso

Clear-cell ameloblastoma (clear-cell odontogenic carcinoma) is an uncommon odontogenic epithelial neoplasm. We report a case of a well-circumscribed 2 cm radiolucent lesion of the anterior mandible in a 30-year-old woman; this tumor was curetted. The first recurrence (at 5-year follow-up) was treated by aggressive curettage, and in the second recurrence a block resection was performed. However, 2 years after the resection was performed, the tumor recurred for a third time as an extraosseous gingival tumor, and 6 months later a recurrence was noted involving only alveolar mucosa

Melanotic neuroectodermal tumor of infancy: case report / Tumor neuroectodérmico melanótico na infância: relato de caso

The melanotic neuroectodermal tumor of infancy (MNTI) is an uncommon benign neoplasm, frequently detected in young infants, which has a predilection for the head and neck region, particularly maxilla. The purpose of this article is to present a documented case of MNTI and discuss clinical, radiological and histopathological features of the disease. The biological behavior of the tumor is emphasized

Tumor dentinogênico de células fantasmas: relato de um caso / Dentinogenic ghost cells tumor: case report

Um caso raro de tumor dentinogênico de células fantasmas, num paciente de 75 anos, é relatado. Tal lesäo, uma variante do cisto odontogênico calcificante, se caracteriza por uma proliferaçäo de células semelhantes a ameloblastos com uma formaçäo näo usual de células fantasmas, dispostas sob a forma de ilhotas ou cordöes que podem sofrer calcificaçäo. É comum encontrar-se material semelhante à dentina (material dentinóide) em íntimo contato com o epitélio odontogênico. Segue-se uma revisäo da literatura, enfocando principalmente a origem e a histogênese controversa do tumor

Tratamento cirúrgico de uma paciente com displasia crânio diafisária / Surgical treatment of cranio diaphyseal dysplasia

Os autores apresentam os achados clínicos, radiológicos e histopatológicos de uma paciente portadora de displasia crânio-diafisária (leontíase óssea), com 7 anos de evoluçäo. O desenvolvimento exagerado dos ossos faciais e os episódios repetidos de sangramento gengival, justificaram a indicaçäo cirúrgica em caráter excepcional neste caso. Desta forma, observou-se a exeqüibilidade do tratamento cirúrgico, a despeito da grande dificuldade pelo excessivo sangramento. Dois anos de seguimento pós-operatório mostraram a excelente qualidade de vida da paciente, que certamente näo teria sem cirurgia