Massa abdominopélvica de crescimento rápido - ser ou não ser, nem tudo o que vemos é o que parece

O achado de uma massa pélvica constitui frequentemente uma preocupação para as nossas pacientes. Estabelecer o correto diagnóstico e o estadiamento destes tumores com precisão é mandatório, mas por vezes difícil, uma vez que as massas abdominais podem ser benignas ou malignas e ter diferentes etiologias. Apresentamos um caso de crescimento rápido de um tumor abdominal associado a perda de peso e outros sintomas, que em conjunto com os exames realizados colocaram um desafio à equipe. Somente após a cirurgia os autores confirmaram o diagnóstico definitivo de leiomioma. As aparências iludem.The finding of a pelvic mass is often a source of great concern to our patients. Establishing the correct diagnosis and accurately staging these tumors is mandatory, but sometimes difficult, as abdominal masses may prove to be benign or malignant and have different etiologies. We describe a patient with a rapidly growing abdominal mass with weight loss and other accompanying symptoms, that together with the exams performed, posed a genuine diagnostic challenge to the team. Only after surgery the authors reached the definitive diagnosis of leiomyoma. Still waters run deep

Supercritical fluid extraction of fish oil from fish by-products: A comparison with other extraction methods

Fish and fish by-products are the main natural source of omega-3 polyunsaturated fatty acids, especially EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), both of them with a great importance in the food and pharmaceutical industries. Comparing to conventional fish oil extraction processes such as cold extraction, wet reduction or enzymatic extraction, supercritical fluid extraction with carbon dioxide under moderate conditions (25 MPa and 313 K) may be useful for reducing fish oil oxidation, especially when fish oil is rich in omega-3 such as salmon oil, and the amount of certain impurities, such as some species of arsenic. Furthermore, taking profit of the advantages of supercritical carbon dioxide as extractive solvent, a coupled extraction-fractionation process is proposed as a way to remove free fatty acids and improve fish oil quality, alternatively to physical and chemical refining procedures.Ministry of Education and Science (CTQ2005-07301), Junta de Castilla y León (GR 167) and Pescanova S.A. (Spain

Volatile oxidation products formed in crude herring oil under accelerated oxidative conditions

Crude fish oil produced from herring byproducts was evaluated on its oxidative stability by a number of complementary methods. The oil was placed in a closed vessel, exposed to pure oxygen, and kept at 50 °C for up to 53 h. Six volatile compounds contributing to off-flavor in the oil were followed over time. Simultaneously, conventional oxidative chemical measurements were carried out. The results showed that, apart from 4-(Z)-heptenal, all the other components increased with time. The rate of formation of fluorescent compounds, being only time-dependent, showed to be the simplest model to describe the progress of oxidation, in opposition to the development of hexanal. Development of 1-penten-3-one correlated well with peroxide and anisidine values (r = 0.938 and r = 0.931, respectively). Correlations between the volatiles were also found. Within the applied conditions, 1-penten-3-one and 2,4-(E, E)-heptadienal could be useful as volatiles indicators for the oxidative status of the oil