RESUMO
BACKGROUND: Ameloblastoma with adenoid features are characterized by the presence of duct-like structures formed from the parenchyma of the tumor. This study was conducted to report a series of eight ameloblastomas with adenoid features, highlighting their clinicopathological and immunohistochemical aspects. MATERIAL AND METHODS: Out of 71 cases of ameloblastomas, this study classified 8 cases as ameloblastomas with adenoid features. Clinicopathological data and immunohistochemistry for CK7, CK14, CK19, IMP3, p53 and Ki-67 were evaluated. RESULTS: From those cases of ameloblastoma exhibiting adenoid features, there were 4 women and 4 men, with mean age of 39 years. Most cases affected the mandible and all presented radiographically as a radiolucency. The predominant histopathological features were pseudoducts, squamous metaplasia, nuclear hyperchromatism, clear cells, whorled aspect of epithelial structures, cribriform growth pattern, proliferation of spindle cells and extracellular eosinophilic material. Immunohistochemical analysis showed high expression for CK14 (nâ¯=â¯6) and CK19 (nâ¯=â¯3) and all cases (nâ¯=â¯8) were negative for p53, IMP3 and CK7. In addition, all samples (nâ¯=â¯8) showed low expression for Ki-67. CONCLUSIONS: The similarities between the histopathological and immunohistochemical features of eight cases described in the present study and those described in previous studies support the possibility that these lesions are adenoid ameloblastomas. In addition, the immunohistochemical results of CK14, CK19, p53 and Ki-67 did not differ from those of conventional ameloblastomas.
Assuntos
Tonsila Faríngea , Ameloblastoma/patologia , Tonsila Faríngea/ultraestrutura , Feminino , Humanos , Masculino , Mandíbula/patologiaRESUMO
In a previous study of adenoid tissue from allergic and non-allergic patients, we concluded that in allergic children edema of the "chorium" was present in 80.4% and that treatment with antihistamine drugs may reduce this edema. The purpose of the present study was to compare the histopathology of the palatine tonsil and adenoid from allergic patients. Tissue samples were obtained from 153 patients (56 tonsils and 97 adenoids from allergic children). We analysed the intensity of the edema and its cellular components in the chorium of palatine tonsils and adenoids. The frequently seen edema in the adenoids was significantly different from that in the tonsils. The squamous epithelium of the tonsils was thicker and bad stronger intercellular junctions than the columnar epithelium of the adenoids. This fact probably makes difficult the contact of the antigen with the chorium.