Tumor odontogênico adenomatoide mimetizando um cisto radicular / Adenomatoid odontogenic tumour mimetizing a radicular cyst

O tumor odontogênico adenomatoide (TOA) foi considerado como uma entidade clínica distinta, em 1969, por Philipsen e Birn. Trata-se de um tumor odontogênico, de caráter totalmente benigno, assintomático, de crescimento lento e raramente atingindo tamanho maior que 3 cm. Acomete, preferencialmente, a região anterior dos ossos gnáticos, principalmente a maxila, ocorrendo duas vezes mais no gênero feminino, sendo incomum em pacientes maiores que 20 anos. O objetivo deste trabalho é relatar um caso clínico atípico de tumor odontogênico adenomatoide em região anterior de mandíbula, mimetizando cisto radicular, acometendo um paciente de 45 anos, do gênero masculino, tratado com enucleação cirúrgica. O paciente encontra-se atualmente em proservação, não apresentando sinais clínicos e imaginológicos de recidiva. No presente artigo, os aspectos clínicos, radiográficos e histológicos do tumor odontogênico adenomatoide serão discutidos assim como o tratamento recomendado... (AU)

Adenomatoid Odontogenic Tumor (AOT) was so classified as a new tumor in 1969 by Philipsen and Birn. This odontogenic tumor is benign, asymptomatic, has a slow growing and rarely reach a size greater than 3 cm. AOT usually occurs in anterior jaw bones, affects females twice more than males and is unusual in patients older than 20 years-old. The aim of this study is to report an atipic case of AOT in the anterior mandible mimetizing a radicular cyst, affecting a 45 years-old male patient, who was treated by surgical enucleation. The patient has been followed-up and has no clinical and imaging signs of recurrence. In this paper, adenomatoid odontogenic tumor's clinical, radiographic and histological aspects will be discussed, as well the recommended treatment... (AU)

Analysis of the Neoplastic Nature of Odontogenic Keratocyst and its Comparison with other Selected Benign Odontogenic Tumours: An Immunohistochemical Analysis

Odontogenic keratocyst (OKC) first described by Philipsen in 1956 constitutes approximately 11% of all cysts of the jaws. Adenomatoid odontogenic tumour (AOT) is an uncommon, benign epithelial lesion of odontogenic origin. The aim of this study was to analyse the expression of Bcl-2 in OKC and its comparison with other selected benign odontogenic tumours (OTs). Ten formalin fixed paraffin embedded blocks of OKCs, five each of AOT and unicystic ameloblastoma Bcl-2 protein is characterized by its ability to inhibit apoptosis. OKC were characterized by higher expression of Bcl-2 in basal cell epithelium. AOT and unicystic ameloblastoma differed from OKC in a wide spectrum of apoptosis and/or cell cycle-related protein expressions, higher proliferation in the basal cell layer, and vice versa, lower proliferation in the suprabasal cell layer. The solitary OKC seems to be less biologically aggressive and should be classified as a cyst rather than a tumour, means that at least few of OKCs manifests as ordinary cysts. Some of the present study findings could support the theory that OKCs are with high proliferative, probably that these lesions are developmental cysts with some neoplastic properties because of the high intrinsic growth potential. WHO recommends the term KCOT as it better reflects the neoplastic nature of the lesion; however, this reclassification has not yet been universally accepted.

Adenomatoid Odontogenic Tumour– A case report

Adenomatoid odontogenic tumour (AOT) is a benign, non-invasive odontogenic tumour with slow and sustained growth. It is relatively rare and unusual, and mainly affects females in their second decade of life, exhibiting predilection for the anterior region of the maxilla. The lesion is usually associated with the crown of an enclosed tooth, most commonly the maxillary canine. In this paper, we present a case of a 19-year-old female having the classical clinical, radiological and histopathological features, leading to the diagnosis of AOT.

Adenomatoid odontogenic tumour - an unusual extrafollicular variant of the posterior mandible.

Adenomatoid odontogenic tumor (AOT) is a relatively uncommon distinct odontogenic neoplasm. Although this lesion was formerly considered to be the variant of ameloblastoma, its clinical features and biologic behavior indicate, that it is a separate entity. It is a tumor of odontogenic epithelium with duct like structures and with varying degrees of inductive change in the stroma. It is a benign and slow growing tumor which is usually located in the anterior region of the maxilla without pain, and represents 3% of all odontogenic tumors. Most adenomatoid odontogenic tumors (AOTs) occur intra-osseously. They surround the crowns and are attached to the necks of unerrupted teeth in a true follicular relationship, whereas the extrafollicular type has no relation with an impacted tooth, and the peripheral variant is attached to the gingival structures. The aim of this paper is to present a rare case of an extrafollicular AOT occurring in the posterior aspect of the mandible which is distinct

Tumor odontogênico adenomatóide associado a cisto dentígero: relato de um caso incomum / Adenomatoid odontogenic tumour associated with dentigerous cyst: unusual case report

O tumor odontogênico adenomatóide é uma lesão relativamente incomum, que acomete preferencialmente indivíduos do sexo feminino durante a segunda década de vida, exibindo como sítio de predileção a região anterior da maxila. A lesão geralmente está associada à coroa de um dente incluso, comumente o canino. Neste trabalho é relatado o caso de um tumor odontogênico adenomatóide associado a cisto dentígero ocorrendo na região maxilar esquerda, em paciente do sexo feminino com 13 anos de idade, discutindo-se, ainda, as características clínicas, radiográficas, histopatológicas e terapêuticas do caso.

The adenomatoid odontogenic tumor is a relatively uncommon lesion which mainly affects females in their second decade of life, exhibiting predilection for the anterior region of the maxilla. The lesion is usually associated with the crown of an enclosed tooth, most commonly the maxillary canine. In this paper we present a case of adenomatoid odontogenic tumor associated with a dentigerous cyst affecting the left maxillary region in a 13-year-old female. The authors also discuss clinical, radiographic, histopathologic and therapeutic features of the case.