Metastase de la voûte crânienne Revelant un carcinome differencie De la thyroïde

Les métastases des carcinomes thyroïdiens au niveau de la voûte crânienne sont extrêmement rares. Bien que ces métastases soient de mauvais pronostic, la détection précoce et l’administration d’un traitement approprié peuvent améliorer la survie et la qualité de vie. Nous rapportons deux cas de carcinomes différenciés thyroïdiens révélés par une métastase de la voûte crânienne.Mots clés: métastase, voûte crânienne, cancer de la thyroïdeThyroid carcinoma with metastasis to the cranial vault is extremely rare. Although these metastasis had poor prognosis, early detection and administration of appropriate therapy using radioactive iodine seems likely to improve the survival rate and quality of life. We report two cases of differentiated thyroid carcinoma revealed by vault metastasis.Keywords: metastasis, cranial vault, thyroid carcinom

Synthesis by the polyol process and ionic conductivity of nanostructured La2Mo2O9 powders

International audienceLa2Mo2O9 nanostructured powders were synthesized by the polyol process. The effects of the nature of the polyol, the refluxing time, the hydrolysis ratio, the metal concentration and the addition of hydroxide ions, on the purity and morphology of the powders are determined. Two main morphologies are observed, the particles being in the shape of platelets or spheres, with respectively diethylene glycol or ethylene glycol as solvent. A specific surface area of 24 m2/g was reached by varying the metal concentration. The conductivity measurements were recorded on pellets that present in some cases a closed porosity, the relative density reaching 95% without any milling step. According to the synthesis parameters, the grain conductivity can be slightly increased, the total conductivity remaining only slightly lower than that of pellets made of powders synthesized by solid state reaction