Pancreatic Serous Cystadenoma with Compression of the Main Pancreatic Duct: An Unusual Entity

Serous cystadenoma is a common benign neoplasm that can be managed without surgery in asymptomatic patients provided that the diagnosis is certain. We describe a patient, whose pancreatic cyst exhibited a radiological appearance distinct from that of typical serous cystadenoma, resulting in diagnostic difficulties. CT and MRI showed a 10 cm-polycystic tumor with upstream dilatation of the main pancreatic duct (MPD), suggestive of intraductal papillary mucinous tumor (IPMT). Ultrasonographic aspect and EUS-guided fine-needle aspiration gave arguments for serous cystadenoma. ERCP showed a communication between cysts and the dilated MPD, compatible with IPMT. The patient underwent left pancreatectomy with splenectomy. Pathological examination concluded in a serous cystadenoma, with only a ductal obstruction causing proximal dilatation

Intérêt de l'exploration de l'intestin grêle par la vidéocapsule endoscopique chez les patients suspects de maladie de Crohn

LILLE2-BU Santé-Recherche (593502101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Tumeur intracanalaire papillaire et mucineuse du pancréas (à propos d'une série lilloise de 19 cas)

LILLE2-BU Santé-Recherche (593502101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Apport de l'exploration de l'intestin grêle par la vidéocapsule dans le diagnostic des colites indéterminées et dans les récidives post opératoires de maladie de Crohn

LILLE2-BU Santé-Recherche (593502101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Vidéo entéroscopie poussée au CHRU de Lille (étude de 128 patients)

LILLE2-BU Santé-Recherche (593502101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Well-suited and adaptive post-processing for the visualization of hp simulation results

International audienceWhile high order methods became very popular as they allow to perform very accurate solutions with low computational time and memory cost, there is a lack of tools to visualize and post-treat the solutions given by these methods. Originally, visualization softwares were developed to post-process results from methods such that finite differences or usual finite elements and therefore process linear primitives. In this paper, we present a methodology to visualize results of high order methods. Our approach is based on the construction of an optimized affine approximation of the high order solution which can therefore be handled by any visualization software. A representation mesh is constructed and the process is guided by an a posteriori estimate which control the error between the numerical solution and its representation pointwise. This point by point control is crucial as under their picture form, data correspond to values mapped on elements where anyone can pick up a pointwise information. A strategy is established to ensure that discontinuities are well represented. These discontinuities come either from the physical problem (material change) or the numerical method (discontinuous Galerkin method) and are pictured accurately. Several numerical examples are presented to demonstrate the potential of the method

Pollution effects on leaf litter decomposition

International audienc

Stoichiometry of Plant Litter Decomposition in Stream Ecosystems

International audienceEcological stoichiometry is an approach of ecology aimed at understanding the causes and consequences of elemental imbalances in nature (mainly focusing carbon, nitrogen, and phosphorus), from molecular to ecosystem levels. Like most detritus in nature, plant litters are nutrient depleted, and both microbial decomposers and detritivores are exposed to large stoichiometric constraints. These nutritional constraints will ultimately control litter decomposition rates, nutrient mineralization, and affect, in turn, decomposers’ community structures. To consider such stoichiometric constraints could greatly help understanding the functioning of detritus-based ecosystems. In this chapter, focused on leaf litter, diverse examples of stoichiometric constraints at play at the detritus-decomposer interface in aquatic ecosystems are presented. The different steps involving stoichiometric processes and ultimately conducting to litter decomposition, from the production of leaf litter in the riparian zones of freshwater ecosystems to its incorporation in aquatic food webs and its potential recycling in freshwater ecosystems are discussed. Stoichiometric constraints arising between detritus and decomposers in freshwater ecosystems are then placed into the context of current global change. Finally, we highlight the limits of the stoichiometric approach as well as some complementary approaches and perspectives of work are proposed