• Radiation Oncology Journal
• /
• v.31 no.4
• /
• pp.260-266
• /
• 2013

A clear consensus has not been established regarding the best treatment for solitary bone metastasis. Here, we reviewed the medical records of patients with a controlled primary malignancy who had only solitary spine metastasis without metastasis to the extraspinal bone or viscera and underwent treatment between April 2007 and December 2012 with stereotactic body radiosurgery using CyberKnife, with a total dose of 24 Gy in three to four fractions. During that time, there were only four cases. This was effective in each case, and all the four patients had no local failure and remained alive at a median follow-up of 68 months (range, 64 to 80 months). Although our experience is limited, this study suggests that stereotactic body radiotherapy could be a feasible, safe, effective, and noninvasive alternative treatment for solitary spine metastasis in patients who are medically inoperable or unsuitable for surgery.

• Proceedings of the IEEK Conference
• /
• 2003.07a
• /
• pp.262-265
• /
• 2003

Radiofrequency thermal ablation (RTA) as one of the microwave hyperthermia is becoming the treatment of choice for small but inoperable tumors of the liver. In this paper, we designed the applicator composed of semi-rigid coaxial cable antenna with a ring slot for RTA. To optimize the maximum output of radiation at 2450 MHz, we simulated the antenna using Electromagnetic simulation tools Maxwell program and analyzed the return loss and the electric field $E_{tot}$ at the near-field region between the simulation results and measurement results. As a result, we obtained the return loss of -29.786 dB at 2450 MHz when the antenna was placed between two blocks of a pig's liver, and the measurement results agreed with the simulation results well. Therefore, this semi-rigid coaxial cable antenna with a ring slot can be used very usefully as the applicator for RTA.r RTA.A.

• Journal of Chest Surgery
• /
• v.22 no.2
• /
• pp.315-320
• /
• 1989

Dysphagia is common symptom in patients with advanced esophageal cancer, which is not to be resected surgically. Especially when esophagorespiratory fistula is complicated, it leads to rapid deterioration and death due to pulmonary infection. Esophageal intubation relieves dysphagia as simple surgical execution and offers rapid effectiveness. For six patients with inoperable esophageal cancer including three esophago-respiratory fistulas, the palliative esophageal intubation was performed in Korea Cancer Center Hospital, in 1988. Traction technique via high gastrotomy with Celestin tube was used. Adequate palliation of dysphagia was achieved in 5 patients, but wound infection was developed in 2 patients, tube migration in 2 patients, and 2 died in hospital due to sepsis on the 16th and 42nd postoperative day, respectively. In 3 patients with esophagorespiratory fistula complicated after radiation therapy, the intubation was performed urgently and the result was satisfactory in 2 of them that the fistula was occluded successfully and aspiration or pulmonary infection was prevented.

• Journal of Chest Surgery
• /
• v.16 no.4
• /
• pp.594-601
• /
• 1983

Mediastinal tumors have long fascinated the thoracic surgeon because of their variety and unpredictability of diagnosis prior to exploration. We report the analysis of the 110 cases of mediastinal tumors, experienced in the dept. of the thoracic and cardiovascular surgery of the National Medical Center from December 1959 to August 1983. The age distribution was relatively even and the mean age was 37 years old. The germ cell tumors were 29 cases [31%], the neurogenic tumors were 19 cases [20%], the thymomas were 16 cases [17%], the lymphomas were 8 cases [8.5%], the primary or secondary carcinomas were 11 cases [12%], the bronchogenic and the P.W cysts were 4 cases, the mesenchymal tumors were 3 cases, the TB gangliomas were 3 cases among the 94 cases, histologically analysed. The malignant tumors were 39 cases [41%]. In classified by histological types, the tumor size, location and the clinical manifestations are presented. The successful removal was done in 53 cases [96%] among 55 cases of benign mediastinal tumors. In 39 malignant cases, the surgical intervention had been done in 21 cases [54%], and inoperable cases were 16 [41%], and the operative deaths were 2 cases [5%].

• Proceedings of the IEEK Conference
• /
• 2003.11c
• /
• pp.24-27
• /
• 2003

Radiofrequency ablation (RFA) as one of the microwave hyperthermia is becoming the treatment of choice for small but inoperable tumors of the liver. In this paper, we designed the applicator composed of semi-rigid coaxial cable antenna with a ring slot for RFA. To optimize the maximum output of radiation with omni direction at 2450 ㎒, we simulated the applicator using Electromagnetic simulation program and analyzed the return loss and the electric field E$\_$tot/ at the near-field region between the simulation results and measurement results. As a result, we obtained the return loss of -29.786 dB at 2450 ㎒ when the applicator was placed between two blocks of a pig's liver, and the measurement results agreed with the simulation results well. Therefore, this applicator using semi-rigid coaxial cable antenna with a ring slot can be used very usefully as the applicator for RFA.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2009.05a
• /
• pp.321-323
• /
• 2009

When power failure occurs at multi-housing complex, auxiliary generator or emergency generator starts to provide power to households. This power is connected to emergency power ELB(Earth Leakage Breaker) at home distribution panel board and supplies power only for emergency light in living room but for heating system, refrigerator and other inevitable apparatuses that are in need of uninterruptible power. Since those domestic appliance are fed from common power line, they are inoperable during power failure. Our research is to resolve this problem by developing compatible relay-drive common/emergency-power ATS (automatic transfer switch) for home distribution panel board. In case of power failure, it transfers automatically and commences to provide power from emergency generator. Through this, Consumers can reach satisfaction where common power loads operate without any problem under both ordinary and power failure condition.

• Journal of Chest Surgery
• /
• v.51 no.6
• /
• pp.419-422
• /
• 2018

Hemangioendothelioma is a rare vascular tumor with involvement of the liver, brain, long bones, and lung. Among the 6 histological subtypes, epithelioid hemangioendothelioma (EHE) is the most aggressive. Its occurrence in the mediastinum is quite rare, and very few cases have been documented. The reported cases in the literature have described difficulties in the preoperative diagnosis due to the unusual histological appearance of the tumor. Immunohistochemistry remains the mainstay for a definitive diagnosis. Due to its low incidence, there is no standard treatment for mediastinal EHE, but curative resection is the preferred treatment option where possible, with chemotherapy used as an adjuvant treatment or in cases of widespread inoperable disease. The present case study describes an aggressive EHE occurring in an 18-year-old woman in the anterior mediastinum.

• Journal of Chest Surgery
• /
• v.54 no.1
• /
• pp.75-78
• /
• 2021

Minimally invasive cryoablation is often considered for lung tumor patients with high surgical risk or inoperable metastatic lung tumors. Cryoablation is a type of thermal percutaneous ablation in which argon and helium gases are delivered via a cryoprobe to induce tissue freezing and necrosis. We report the case of a 23-year-old woman who had suffered from multiple pulmonary endometriosis with frequent intermittent hemoptysis during menstruation for 6 years prior to her visit. She was treated with cryoablation at our hospital, and since her treatment, she has been doing well with no hemoptysis for at least 6 months. Although endometriosis is a benign lung disease, cryoablation is an ideal and effective treatment option for patients with multiple endometriosis.

• Journal of the Korean Society of Industry Convergence
• /
• v.25 no.6_1
• /
• pp.941-952
• /
• 2022

In this study, additive manufacturing technology was applied to restore a planner miller that was unusable due to aging. The drive spur gear of the planner miller was inoperable due to many defects in the teeth. The shape of the defective gear teeth was restored by deposition of the defective teeth using the DED method. However, as the location of the deposition head and the location of the set origin became farther, the deposition shape was different from the modeling shape. Nonetheless, since the modeling of the deposition part was designed to be larger than the tooth shape of the original gear, it was possible to completely restore all gear teeth through post-processing. The arrangement interval of the flow lines of the deposition part was narrower than that of the substrate. The hardness of the substrate was 172 HV, and that of the deposition part was 345 HV, which was twice as high as that of the substrate.

• Clinical Endoscopy
• /
• v.56 no.2
• /
• pp.155-163
• /
• 2023

Malignant hilar biliary obstruction (MHO), an aggressive perihilar biliary obstruction caused by cholangiocarcinoma, gallbladder cancer, or other metastatic malignancies, has a poor prognosis. Surgical resection is the only curative treatment for biliary malignancies. However, the majority of patients with MHO cannot undergo surgery on presentation because of an advanced inoperable state or a poor performance state due to old age or comorbid diseases. Therefore, palliative biliary drainage is mandatory to improve symptomatic jaundice and the quality of life. Among the drainage methods, endoscopic biliary drainage is the current standard for palliation of unresectable advanced MHO. In addition, combined with endoscopic drainage, additional local ablation therapies, such as photodynamic therapy or radiofrequency ablation (RFA), have been introduced to prolong stent patency and survival. Currently, RFA is commonly used as palliative therapy, even for advanced MHO. This literature review summarizes recent studies on RFA for advanced MHO.