Takashi Ito

Huge Cystic Lymphangioma of the Pancreas: Report of a Case

Abstract We report herein the case of a 33-year-old woman who presented with palpable abdominal swelling found to be caused by a huge lymphangioma of the pancreas. An abdominal computed tomographic (CT) scan showed a large multilocular cystic mass with water-dense contents, which was derived from the pancreatic head. A pancreaticoduodenectomy (PD) was performed because the tumor had invaded the duodenum. The resected tumor, which was 23 × 12 × 23 cm in size with 2 l of serous fluid, was pathologically diagnosed as a cystic lymphangioma. The endothelial cells lining the internal surface of the cystic spaces were immunohistochemically positive for factor VIII-R antigen and CD31. Our review of the literature revealed 45 reports of lymphangioma of the pancreas, including this one, but to the best of our knowledge this is only the fifth case that required a PD. Nevertheless, we recommend that a complete resection be performed to reduce the risk of recurrence.

Improving the sensitivity verification method of the UHF PD detection technique for GIS

In the paper, several proposals to improve the sensitivity verification method for the application of UHF partial discharge monitoring systems in GIS, as described in CIGRE Electra No. 183, are presented. Verification results, which depend on the rise time of the test pulse signal, have previously been proposed to compensate for the various rise time pulses with their voltage magnitudes. As a complementary test method to the CIGRE Electra method, a network analyzer measurement is proposed. The influence of the rise time was experimentally investigated using a test GIS setup that had two internal type PD couplers. The scattering parameters of the test GIS were measured, and the computer simulation results corresponded well with the measurement results. The CIGRE method was applied to a 400 kV GIS and the test results of two different rise time conditions were analyzed. An increase of the magnitude due to a longer coaxial cable was demonstrated. The network analyzer method enables compensation of the test pulse specifications, and the scattering parameter data can be used to obtain a GIS trade certificate with the PD coupler. Pulse generators with a rise time shorter than 500 ps are subject to export control regulations when implementing the CIGRE method internationally, which makes the network analyzer advantageous in that it is free from this regulation in terms of using it for UHF measurements.

Distal gastrectomy with reconstruction of the right gastroepiploic artery for gastric cancer after coronary artery bypass grafting: Report of a case

A 61-year-old man was found to have anemia 3 years after an aortic valve replacement (AVR) and coronary artery bypass grafting (CABG) of the left intrathoracic artery to the left anterior descending artery and the right gastroepiploic artery (RGEA) to the right coronary artery (RCA) for aortic insufficiency and angina pectoris. A IIc gastric cancer in the antrum was subsequently diagnosed. Computed tomography (CT) and coronary angiography showed lymph node metastasis at the root of the RGEA, which perfused a large area of the inferoposterior wall of the heart. To prevent cardiac ischemia and perform complete #6 lymph node dissection, percutaneous intervention was carried out on the RCA before distal gastrectomy with D2 lymph node dissection, and the RGEA was reconstructed as a free graft to the left gastric artery. This procedure may be a surgical option for gastric cancer in patients who have undergone CABG using the RGEA.

Change in corrosivity of insulating oil caused by oxidative deterioration of the oil

The authors investigated how changes in the molecular structure of sulfur compounds in mineral insulating oils affect their corrosivity. A method for the quantitative evaluation of corrosivity of insulating oils was developed and used in this study. Several types of sulfur compounds were found to cause sulfur corrosion. However, hydrotreated oil was noncorrosive because the sulfur compounds which cause sulfur corrosion were easily removed through hydrotreatment. The results of thermal aging tests using model sulfide compounds showed that the corrosivity of sulfide-added oils increased with longer heating times due to generation of sulfoxide, caused by the oxidation of sulfide. The corrosivity of aged oils depends on the concentration of sulfoxide in the oils. Meanwhile, the corrosivity of a commercial insulating oil did not change drastically in the thermal aging test, despite the fact that this oil contained a certain amount of sulfide.