120 research outputs found
Current Challenges in Financing Agricultural Cooperatives
Agricultural, Cooperatives, Finance, Agribusiness, L10, L23, L16, Q13,
Case report: Association between PTEN-gene variant and an aggressive case of multiple dAVFs
IntroductionMutations of the phosphatase and tensin homolog (PTEN) gene have been associated with a spectrum of disorders called PTEN hamartoma tumor syndrome, which predisposes the individual to develop various types of tumors and vascular anomalies. Its phenotypic spectrum includes Cowden syndrome (CS), Bannayan–Riley–Ruvalcaba syndrome (BRRS), Proteus syndrome, autism spectrum disorders (ASD), some sporadic cancers, Lhermitte–Duclos disease (LDD), and various types of associated vascular anomalies.Clinical presentationA previously healthy 27-year-old woman was experiencing visual scintillating scotomas and mild chronic headaches for the past 2 years. The initial computed tomographic (CT) and magnetic resonance imaging (MRI) scans did not reveal any abnormalities, but the possibility of pseudotumor cerebri was considered. Furthermore, a cerebral angiogram showed a posterior fossa dural arteriovenous fistula (dAVF), which was initially treated through embolization. However, in spite of proper treatment, this patient experienced multiple recurrent dAVFs in different locations, requiring multiple embolizations and surgeries. Despite exhibiting altered cerebral perfusion and hemodynamics, the patient did not display any significant symptoms until she experienced a sudden stroke resulting from deep venous thrombosis, which was not associated with any medical procedures or medication use. A comprehensive analysis was performed due to the aggressive nature of the dAVFs. Surprisingly, exome sequencing of a blood sample revealed a PTEN gene variant in chromosome 10, indicative of Cowden syndrome. However, no tumors or other vascular lesions were detected in other systems that would constitute Cowden syndrome.ConclusionThe rapid formation of multiple and complex dAVFs, coupled with not meeting the criteria for any other PTEN-related syndrome, unequivocally leads to the presentation of a novel phenotype of the PTEN germline variant
Texture analysis-and support vector machine-assisted diffusional kurtosis imaging may allow in vivo gliomas grading and IDH-mutation status prediction:a preliminary study
We sought to investigate, whether texture analysis of diffusional kurtosis imaging (DKI) enhanced by support vector machine (SVM) analysis may provide biomarkers for gliomas staging and detection of the IDH mutation. First-order statistics and texture feature extraction were performed in 37 patients on both conventional (FLAIR) and mean diffusional kurtosis (MDK) images and recursive feature elimination (RFE) methodology based on SVM was employed to select the most discriminative diagnostic biomarkers. The first-order statistics demonstrated significantly lower MDK values in the IDH-mutant tumors. This resulted in 81.1% accuracy (sensitivity = 0.96, specificity = 0.45, AUC 0.59) for IDH mutation diagnosis. There were non-significant differences in average MDK and skewness among the different tumour grades. When texture analysis and SVM were utilized, the grading accuracy achieved by DKI biomarkers was 78.1% (sensitivity 0.77, specificity 0.79, AUC 0.79); the prediction accuracy for IDH mutation reached 83.8% (sensitivity 0.96, specificity 0.55, AUC 0.87). For the IDH mutation task, DKI outperformed significantly the FLAIR imaging. When using selected biomarkers after RFE, the prediction accuracy achieved 83.8% (sensitivity 0.92, specificity 0.64, AUC 0.88). These findings demonstrate the superiority of DKI enhanced by texture analysis and SVM, compared to conventional imaging, for gliomas staging and prediction of IDH mutational status
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Sustainable development goal 2: improved targets and indicators for agriculture and food security
The pursuit of global food security and agricultural sustainability, the dual aim of the
second Sustainable Development Goal (SDG-2), requires urgent and concerted action
from developing and developed countries. This, in turn, depends on clear and
universally applicable targets and indicators which are partially lacking. The novel and
complex nature of the SDGs poses further challenges to their implementation on the
ground, especially in the face of interlinkages across SDG objectives and scales. Here
we review the existing SDG-2 indicators, propose improvements to facilitate their
operationalization and illustrate their practical implementation in Nigeria, Brazil and the
Netherlands. This exercise provides insights into the concrete actions needed to
achieve SDG-2 across contrasting development contexts and highlights the challenges
of addressing the links between targets and indicators within and beyond SDG-2.
Ultimately, it underscores the need for integrated policies and reveals opportunities to
leverage the fulfillment of SDG-2 worldwide
Is the omega sign a reliable landmark for the neurosurgical team? An anatomical study about the central sulcus region
Farmers’ self-reported value of cooperative membership: evidence from heterogeneous business and organization structures
CaracterÃsticas morfológicas do lobo da Ãnsula em pacientes portadores de epilepsia do lobo temporal medial
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