1000 resultados para Complexo de von Meyenburg


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A correta identificação de tumores hepáticos benignos é importante, pois a maioria não necessita de conduta intervencionista. Os autores relatam os aspectos ultra-sonográficos dos hamartomas de ductos biliares (complexo de von Meyenburg) em 16 pacientes estudados prospectivamente, resultados de uma busca ativa de oito anos. Em 14 pacientes foram identificadas múltiplas lesões menores ou iguais a 0,8 cm, e em dois, apenas duas lesões em cada (medindo de 0,4 cm a 1,3 cm). O aspecto ultra-sonográfico que predominou foi o de múltiplas pequenas imagens hiperecogênicas com ou sem reverberação sonora posterior e margens irregulares (14 pacientes). Menos comumente, foi encontrado o aspecto "em alvo", com centro com maior ecogenicidade que a periferia (dois pacientes com duas lesões cada) e margens bem definidas.

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Os hamartomas biliares, conhecidos como complexo de von Meyenburg, são lesões tipicamente benignas que podem mimetizar metástases aos exames de imagem. Neste estudo é relatado um caso de complexo de von Meyenburg e são discutidos o diagnóstico por imagem, a associação com doença policística do adulto, e o potencial maligno atualmente considerado e frequentemente ignorado deste achado, que torna necessário o acompanhamento

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O aspecto ultra-sonográfico dos hamartomas dos ductos biliares pode variar, sendo importante reconhecer suas diferentes formas de apresentação, para que possam ser lembrados no diagnóstico diferencial de lesões focais hepáticas. Neste trabalho, os autores apresentam um caso desta afecção em que foram identificados inúmeros nódulos hiperecogênicos dispersos pelo parênquima hepático, com os maiores atingindo 1,6 cm, sem produzir reverberação sonora posterior.

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Purpose: To assess possible association between intrinsic structural damage and clinical disability by correlating spinal cord diffusion-tensor (DT) imaging data with electrophysiological parameters in patients with a diagnosis of multiple sclerosis (MS). Materials and Methods: This study was approved by the local ethical committee according to the declaration of Helsinki and written informed consent was obtained. DT images and T1- and T2-weighted images of the spinal cord were acquired in 28 healthy volunteers and 41 MS patients. Fractional anisotropy (FA) and apparent diffusion coefficients were evaluated in normal-appearing white matter (NAWM) at the cervical level and were correlated with motor-evoked potentials (n = 34). Asymmetry index was calculated for FA values with corresponding left and right regions of interest as percentage of the absolute difference between these values relative to the sum of the respective FA values. Statistical analysis included Spearman rank correlations, Mann-Whitney test, and reliability analysis. Results: Healthy volunteers had low asymmetry index (1.5%-2.2%). In MS patients, structural abnormalities were reflected by asymmetric decrease of FA (asymmetry index: 3.6%; P = .15). Frequently asymmetrically affected among MS patients was left and right central motor conduction time (CMCT) to abductor digiti minimi muscle (ADMM) (asymmetry index, 15%-16%) and tibialis anterior muscle (TAM) (asymmetry index, 9.5%-14.1%). Statistically significant correlations of functional (ie, electrophysiological) and structural (ie, DT imaging) asymmetries were found (P = .005 for CMCT to ADMM; P = .007 for CMCT to TAM) for the cervical lateral funiculi, which comprise the crossed pyramidal tract. Interobserver reliability for DT imaging measurements was excellent (78%-87%). Conclusion: DT imaging revealed asymmetric anatomic changes in spinal cord NAWM, which corresponded to asymmetric electrophysiological deficits for both arms and legs, and reflected a specific structure-function relationship in the human spinal cord. © RSNA, 2013.

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As glândulas pigidiais, pares, de enhydrus sulcatus abrem-se, em cada lado, na região pleural do 8º segmento abdominal. A glândula possui um ducto excretor. Sua continuação apical forma um volumoso reservatório dilatável, revestido por um retículo muscular que espreme a secreção. Entre estas duas partes, encontra-se uma válvula, para regular a passagem das secreções, caraterisada por uma estrutura cuticular especial. Na região inicial do reservatório estende-se uma placa glandular. Antes da válvula nasce um tubo glandular composto de um canal central e divertículos laterais. As células da placa glandular produzem uma substância aquosa, possuindo sòmente poucos componentes orgãnicos e que consideramos como sendo o veículo das secreções oleosas do tubo glandular. As células glandulares possuem um aparêlho excretor intra-celular, denominado, por outros autores, como "Binnenblase" (vesícula interna), enquanto que nós o consideramos como sendo um verdadeiro rabdório. O fino tubo cuticular, que penetra neste complexo rabdorial, formando a parte inicial do tubo excretor, representa o verdadeiro pólo apical da célula glandular.

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Vitamin C stability and concentration was evaluated in isotonic beverages and B group vitamins (B1, B2, B3, B5 and B6) in power beverages. The amount of vitamins was found to be above of that declared on the labels, even after the shelf life had been exceeded. A small decrease in the amount of B group vitamins was observed during the shelf life of the products. In the case of vitamin C this decrease was slightly higher. The present research shows the need of increased quality control and inspection.

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There has been a considerable interest in coordination complexes of molecular nitrogen (N2), partly due to a possible relationship between such complexes and the nitrogen activation process in nature. The present paper describes the synthesis and infrared spectroscopic characterization of an iron-nitrogen derivative with ethylenediamine-N,N,N',N'-tetraacetate (edta) as an experiment for an undergraduate course. The topics covered here include synthesis, reactivity and spectroscopy.

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Characteriza of the inclusion complex ropivacaine: beta-cyclodextrin. Ropivacaine (RVC) is a widely used local anesthetic. The complexation of RVC with beta-cyclodextrin (beta-CD) is of great interest for the development of more efficient local anesthetic formulations. The present work focuses on the characterization of the RVC:beta-CD complex by nuclear magnetic resonance (NMR). The stoichiometry of the complex is 1:2 RVC:beta-CD. DOSY-NMR shows that the association constant is 55.5 M-1. Longitudinal relaxation time results show that RVC changes its mobility in the presence of beta-CD. This study is focused on the physicochemical characterization of inclusion complexes that are potentials options for pain treatment.

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Due to its geographical location, the northeastern Coast of Brazil (Litoral Setentrional do Nordeste - LSN) is a hotter and drier climate than the eastern coast. In addition, because of its proximity to caatinga and cerrado, the LSN contains species from these vegetation biomes and from the restinga on the coast, which comprise different plant formations and creates a vegetation complex. Despite the great importance of this ecotone, there are few studies about its flora. The objective of this work was to contribute to what is known about the floristic and phytosociological composition of this region. We made a floristic survey in the area (between 2007 and 2011), consulted herbaria data from the region and made a phytosociological study in a stretch of coastal semideciduous forest (mata de tabuleiro). The study recorded 382 plant species from 96 families. In the phytosociological survey (0.32 ha) we recorded 2,970 individuals and 52 species. The most abundant plants surveyed were the trees Manilkara triflora, Chamaecrista ensiformis and Guapira nitida and the shrubs Cordiera sessilis and Maytenus erythroxyla (average height 3.8 m, average diameter 6.2 cm, basal area 39.28 m²/ha). The local flora includes floristic elements of caatinga, cerrado and restinga, corroborating the idea that the plant community of the coastal region of Ceará has an ecotonal nature.

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Univesidade Estadual de Campinas. Faculdade de Educação Física

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Universidade Estadual de Campinas . Faculdade de Educação Física

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Universidade Estadual de Campinas . Faculdade de Educação Física