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1.
J. appl. oral sci ; 16(6): 414-419, Nov.-Dec. 2008. ilus, tab
Article in English | LILACS | ID: lil-499891

ABSTRACT

Actinic cheilitis is a potentially malignant lip lesion caused by excessive and prolonged exposure to ultraviolet radiation, which can lead to histomorphological alterations indicative of abnormal cell differentiation. In this pathology, varying degrees of epithelial dysplasia may be found. There are few published studies regarding the p53 and MDM2 proteins in actinic cheilitis. Fifty-eight cases diagnosed with actinic cheilitis were histologically evaluated using Banóczy and Csiba (1976) parameters, and were subjected to immunohistochemical analysis using the streptavidin-biotin method in order to assess p53 and MDM2 protein expression. All studied cases expressed p53 proteins in basal and suprabasal layers. In the basal layer, the nuclei testing positive for p53 were stained intensely, while in the suprabasal layer, cells with slightly stained nuclei were predominant. All cases also tested positive for the MDM2 protein, but with varying degrees of nuclear expression and a predominance of slightly stained cells. A statistically significant correlation between the percentage of p53 and MDM2-positive cells was established, regardless of the degree of epithelial dysplasia. The expression of p53 and MDM2 proteins in actinic cheilitis can be an important indicator in lip carcinogenesis, regardless of the degree of epithelial dysplasia.


Subject(s)
Humans , Cheilitis/pathology , /analysis , /analysis , Biomarkers/analysis , Cell Adhesion/genetics , Cell Differentiation/genetics , Cell Nucleolus/ultrastructure , Cell Nucleus/ultrastructure , Cell Polarity/genetics , Cheilitis/genetics , Chromatin/ultrastructure , Cytoplasm/ultrastructure , Epithelial Cells/pathology , Epithelium/pathology , Hyperplasia , Immunohistochemistry , Keratins , Lip/pathology , Mitosis/genetics , Sunlight/adverse effects
2.
Rev. bras. patol. oral ; 4(1): 51-59, jan.-abr. 2005. ilus
Article in Portuguese | LILACS, BBO | ID: lil-415726

ABSTRACT

O tumor odontogênico epitelial calcificante (TOEC) ou tumor de Pindborg é uma neoplasia odontogênica rara de natureza benigna e comportamento biológico localmente agressivo. Apresenta imagem radiográfica de padrão misto devido à presença de calcificações concêntricas observadas microscopicamente. É caracterizado ainda pela presença de células epiteliais poliédricas, pontes intercelulares e depósitos eosinofílicos identificados como amilóide. O objetivo deste trabalho é apresentar um caso clínico de TOEC em paciente do sexo feminino, 51 anos, que procurou o Serviço de Estomatologia da Faculdade de Odontologia da Universidade Federal da Bahia com limitação de abertura bucal e discreto aumento de volume na região posterior da mandíbula no lado esquerdo. Exames imaginológicos demonstraram presença de lesão radiolúcida extensa com áreas de calcificações dispersas, associadas ao terceiro molar não irrompido. A biopsia incisional da lesão revelou o diagnóstico de TOEC e devido à extensão da lesão optou-se pela hemimandibulectomia. O exame da peça cirúrgica confirmou o diagnóstico de TOEC. Após a reconstrução cirúrgica da mandíbula, a paciente encontra-se sob acompanhamento clínico-radiográfico. Com base nos dados revistos da literatura, foram discutidas as características clínicas, imaginológicas e histopatológicas da lesão


Subject(s)
Humans , Female , Adult , Biopsy , Odontogenic Cyst, Calcifying/etiology , Odontogenic Cyst, Calcifying/pathology , Odontogenic Cyst, Calcifying , Tomography, X-Ray Computed
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