Metastasis to the gluteus maximus muscle from renal cell carcinoma with special emphasis on MRI features

<p>Abstract</p> <p>Background</p> <p>The skeletal muscle is an unusual site for metastasis from renal cell carcinoma (RCC). Metastatic RCC must be differentiated from benign primary soft-tissue tumors because aggressive surgical resection is necessary.</p> <p>Case presentation</p> <p>We present the case of a 65-year-old man with metastatic RCC in the gluteus maximus muscle (3.8 cm in diameter) found on enhanced computed tomography (CT) 6 years after nephrectomy. Retrospectively, the small mass (1 cm in diameter) was overlooked 5 years earlier on enhanced CT. Because the growth of the lesion was slow, benign tumor was a differential diagnosis. However, magnetic resonance imaging (MRI) showed that the mass had high-signal intensity on T1- and T2-weighted images (WIs) compared to that of skeletal muscle, with mild enhancement by Gadolinium. The MRI features were unusual for most soft-tissue tumors having low-signal intensity on T1-WI and high-signal intensity on T2-WI. Therefore, under a diagnosis of metastatic RCC, the lesion was resected together with the surrounding skeletal muscle. The histology was confirmed to be metastatic RCC.</p> <p>Conclusion</p> <p>MRI features of metastatic RCC may be beneficial in differentiating it from primary soft-tissue tumor.</p

Nematic quantum critical point without magnetism in FeSe1−xSx superconductors

In most unconventional superconductors, the importance of antifer- romagnetic fluctuations is widely acknowledged. In addition, cuprate and iron-pnictide high-temperature superconductors often exhibit unidirectional (nematic) electronic correlations, including stripe and orbital orders, whose fluctuations may also play a key role for elec- tron pairing. In these materials, however, such nematic correlations are intertwined with antiferromagnetic or charge orders, preventing us to identify the essential role of nematic fluctuations. This calls for new materials having only nematicity without competing or co- existing orders. Here we report systematic elastoresistance mea- surements in FeSe1−xSx superconductors, which, unlike other iron- based families, exhibit an electronic nematic order without accom- panying antiferromagnetic order. We find that the nematic transition temperature decreases with sulfur content x, whereas the nematic fluctuations are strongly enhanced. Near x 0.17, the nematic sus- ceptibility diverges towards absolute zero, revealing a nematic quan- tum critical point. The obtained phase diagram for the nematic and superconducting states highlights FeSe1−xSx as a unique nonmag- netic system suitable for studying the impact of nematicity on super- conductivity.UTokyo Research掲載「新しい種類の超伝導の発生源になりうるか？」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/discovery-may-point-to-new-source-of-superconductivity.htmlUTokyo Research "Discovery may point to new source of superconductivity" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/discovery-may-point-to-new-source-of-superconductivity.htm

First Application of 3D Peripheral Plasma Transport Code EMC3-EIRENE to Heliotron J

The 3D peripheral plasma and neutral transport code, EMC3-EIRENE was applied to the Heliotron J with a wide and flexible controllability of magnetic configuration. This code requires a three-dimensional (3D) grid with high resolution in the peripheral plasma region to reproduce the fine plasma structure. The grid generation tool, FLARE, was utilized to create the grid in conjunction with the code developed to arbitrarily set the outer boundary of the peripheral grid. After setting up the 3D grid, we carried out the EMC3-EIRENE calculation successfully for the first time in the Heliotron J\u27s standard configuration. In addition, the convergence of the iterative calculation and the effects of different grid resolutions upon the calculation were investigated. A good numerical convergence was obtained, and the influence of resolution was observed in the electron density in the divertor region