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1.
Article in Portuguese | LILACS-Express | LILACS, VETINDEX | ID: biblio-1491489

ABSTRACT

Os carcinomas mamários de gatas possuem prognóstico desfavorável, uma vez que tais tumores são bastante agressivos e com grande capacidade de gerar metástases. Objetivou-se, com este estudo, caracterizar sob o ponto de vista histopatológico, neoplasias mamárias de ocorrência espontânea em gatas (Felis catus). Trinta e cinco amostras de tecido neoplásico mamário de gatas foram obtidas por ressecção cirúrgica de animais oriundos da casuística do Hospital Veterinário da Universidade Federal Rural de Pernambuco (UFRPE), período de 2008 a 2010. Os cortes histológicos foram corados pela Hematoxilina-Eosina (HE) e as lâminas foram analisadas em microscopia de luz. Observou-se que 14,29% das lesões eram benignas e 85,71% adenocarcinomas. As lesões de característica benigna foram classificadas como: 60% fibroadenomas, 20% como adenoma simples e 20% como adenose. Os adenocarcinomas apresentavam em sua maioria (86,87%) presença de necrose e tal sinal esteve presente em grande parte do tecido neoplásico, enquanto apenas 40% das lesões benignas apresentavam pequenos focos de necrose. Em relação à presença de infiltrado inflamatório linfoplasmocitário, apenas os carcinomas apresentaram esse sinal. Comprovando a maior a agressividade dos tumores, foi observado um maior número de figuras de mitose em adenocarcinomas (5,33±2,29 mitoses por campo) quando comparadas às lesões de característica be

2.
Otol Neurotol ; 27(1): 27-32, 2006 Jan.
Article in English | MEDLINE | ID: mdl-16371843

ABSTRACT

HYPOTHESIS: Hypercalcemia is thought to perform an important role in the etiopathogenesis of tympanosclerosis. The purpose of the present study was to assess the influence of hypercalcemia in the development of tympanosclerosis in rats with or without acute otitis media. BACKGROUND: The pathogenesis of tympanosclerosis is still unclear. Histologically, it is characterized by a hyaline degeneration in the lamina propria of the middle ear and mastoid mucosa and may lead to a calcification process. The process of calcification is similar to that of other pathologically calcified tissues, such as vessels, heart valves, cornea, and others, which depend on calcium serum levels. METHODS: Twenty-four Wistar rats were divided into two different groups, with one group submitted to hypercalcemia status through calcium diet supplementation and the other used as a control group (normal calcium content diet). Both were submitted to induction of tympanosclerosis by inoculation of Streptococcus pneumoniae on the right middle ear only. Otomicroscopy was conducted every 15 days, and after 7 weeks of inoculation, the animals were killed and the tympanic bullae were resected to be analyzed through light and electron microscopy. RESULTS: The group submitted to hypercalcemia presented a prevalence of tympanosclerosis of 25% against 16.7% in the control group, presenting a relative risk of 1.27 (p=0.72). CONCLUSION: The results suggest that hypercalcemia can have an influence in the development of tympanosclerosis.


Subject(s)
Hypercalcemia/complications , Otosclerosis/etiology , Otosclerosis/pathology , Acute Disease , Animals , Case-Control Studies , Chi-Square Distribution , Microscopy, Electron, Transmission , Microscopy, Polarization , Otitis Media/complications , Rats , Rats, Wistar , Streptococcus pneumoniae/pathogenicity
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