Clear cell odontogenic carcinoma (CCOC) is a rare odontogenic tumor associated with aggressive clinical behavior, metastasis and low survival. We report a case of CCOC affecting the maxilla of 62 year-old woman. It was first described as a clinicopathological entity in 1985 and to date only 67 cases were described in the English literature. We are understanding of the behavior of this carcinomas was depend on limited case reports. For these reason we found important to report this case of CCOC in the maxilla., Zahide Mine Yazici, Ozgur Mete, Zubeyde Elmalı, İbrahim Sayin, Rasim Yilmazer, Fatma Tulin Kayhan, and Literatura 8
Antrochoanal polyps are benign lesions originating from the mucosa of the maxillary sinus. Nasal obstruction and rhinorrhea are their main symptoms. Their endoscopical and radiological appearance makes them relatively easy to diagnose. These polyps are usually presented unilaterally, although bilateral presentation is also possible. We described two cases of atypically giant antrochoanal polyps: in a 15-year-old child and in a 38-year-old man. In both cases, the diagnosis was done by nasal endoscopy and computed tomography (CT) of the paranasal sinuses and supported by histopathological analysis. In the first patient, the excised polyp had the histological characteristic of an angiomatous antrochoanal polyp. Because of their unusual dimension, the combined transoral and endonasal endoscopic approach was performed for complete polyp excision. We discussed the clinical, histopathological and immunohistochemical characteristics of choanal polyps in comparison to inflammatory nasal polyps, and the applicable surgical techniques for treatment of these polyps. and C. Špadijer-Mirković, A. Perić, B. Vukomanović-Đurđević, I. Stanojević
Winter climate determines the success of the two main reproductive strategies employed by aphids. Permanent parthenogens survive as parthenogenetic females in mild winters, but are regularly eliminated by low temperatures; while cyclical parthenogens, which switch to sexual reproduction by the end of summer, produce every year fertilised diapausing eggs resistant to frost.
We have studied the variation in sexual morph production of several clones of the cereal aphid Rhopalosiphum padi (L.) showing both strategies. Twenty clones of this species differing by their geographic origin and their mode of reproduction were placed in two laboratory environments mimicking the changes of photoperiod and thermoperiod occurring naturally from the end of summer and during the autumn in oceanic and continental conditions. The analysis of clonal responses in both climatic conditions showed (i) a wide variation in investment of clones in sexual reproduction with, in particular, evidence for a mixed strategy employed by clones producing both sexuals without ceasing parthenogenetic reproduction, (ii) no geographic adaptation among clones belonging to cyclical parthenogenetic populations, (iii) an earlier production of sexuals in continental conditions and a higher production of males in oceanic conditions.
Furthermore, we have compared the dates of first appearance of sexuals in our experiments with those occurring in the field based on a suction trap database and found that sexuals were caught in nature at least four weeks earlier than in the lab. These results underline the need for a better understanding of the influence of the whole array of environmental factors inducing the transition from parthenogenetic to sexual reproduction in aphids., Maurice Hullé, Damien Maurice, Claude Rispe, Jean-Christophe Simon, and Lit
Riziko CNS progrese u vysoce agresivních lymfomů (lymfoblastový a Burkittův lymfom) dosahovalo v historických souborech až 30%, podařilo se jej však výrazně snížit pomocí intratekální profylaktické terapie a inkorporací systémových cytostatik prostupujících hematoencefalickou bariéru do léčebných protokolů. U ostatních agresivních lymfomů je riziko CNS progrese nižší (pod 10 % v recentních studiích), avšak u vybrané skupiny nemocných se může i zde pohybovat kolem 25–30 %. Bohužel, na rozdíl od lymfoblastového a Burkittova lymfomu se u jiných agresivních histologií nepodařilo profylaktické úspěchy zopakovat. Tento článek se zabývá incidencí, rizikovými faktory a možnostmi profylaxe CNS relapsu u imunokompetentních pacientů s difuzním velkobuněčným B-lymfomem, lymfomem z buněk pláště, periferními T-lymfomy a primárním mediastinálním B-lymfomem. Zmíněny jsou rovněž možnosti terapie CNS progrese, pokud nastane., The risk of CNS progression in highly aggressive lymphomas (lymphoblastic, Burkitt‘s) reached up to 30% in historical cohorts, but it was significantly diminished by intrathecal prophylactic treatment and by incorporation of systemic cytostatics penetrating blood-brain barrier into treatment protocols. In other aggressive lymphomas, the risk of CNS progression is lower (under 10% in recent studies), but in selected patients can even here reach 25–30 %. Unfortunately, unlike in lymphoblastic and Burkitt‘s lymphomas, prophylaxis does not seem to be particularly effective in other histologies. This article discusses incidence, risk factors and prophylactic strategies in immunocompetent patients with diffuse large B-cell lymphoma, mantle-cell lymphoma, peripheral T-cell lymphomas and primary mediastinal B lymphoma. Also, treatment possibilities for CNS relapse, if it occurs, are reviewed., Robert Pytlík, and Literatura