• The Journal of the Korean bone and joint tumor society
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• v.20 no.2
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• pp.60-65
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• 2014

Purpose: To diagnose soft tissue tumor, such as lipoma and Schwannoma, magnetic resonance imaging (MRI) is sufficient in most cases. However, various characteristics are found in MRI images of Schwannoma, thus other type of tumors are often misdiagnosed as Schwannoma with MRI images. In this study, we evaluate the diagnostic value of specific MRI findings of Schwannoma. Materials and Methods: From January 2002 to May 2013, 104 patients who are suspected as Schwannoma rith MRI images are included in data, and the final diagnosis is confirmed with biopsy. Patients are divided into group 1 and group 2 who are confirmed as Schwannoma and other disease with biopsy, respectively. Results: 92 patients were diagnosed as Schwannoma (group 1) and 12 patients were diagnosed as other disease (group 2). We investigate the diagnostic value of specific MRI findings of Schwannoma. 41 patients of group 1 (45%) and 0 patients of group 2 (0%) showed target sign, 47 patients of group 1 (51%) and 2 patients of group 2 (17%) showed fascicular sign, 44 patients of group 1 (48%) and 5 patients of group 2 (42%) showed fat split sign, 28 patients of group 1 (30%) and 1 patients of group 2(9%) showed nerve entering and exiting sign, and 8 patients of group 1 (9%) and 6 patients of group 2 (50%) showed none of four specific findings on their MRI images. 52 patients of group 1 (57%) and 5 patients of group 2 (42%) have tumors on the pathway of nerve. Target sign could be considered as the best diagnostic value of the sign we investigate (p<0.05). Conclusion: Although specific MRI findings have powerful diagnostic value, patients are often misdiagnosed as Schwannoma with MRI findings. Therefore, if patients who are suspected as Schwannoma based on MRI findings have no target sign on their MRI images, we should consider the possibility of other disease.

• Weed & Turfgrass Science
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• v.3 no.4
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• pp.370-377
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• 2014

Research was initiated to evaluate cool-season grass (CSG) overseeding effects on coverage and species transition in Korean lawngrass (Zoysia japonica Steud.) and to determine CSGs and their seeding rate for a practical overseeding. Treatments were comprised of Kentucky bluegrass (KB, Poa pratensis L.), perennial ryegrass (PR, Lolium perenne L.), tall fescue (TF, Festuca arundinacea Schreb.) and their mixtures. Significant differences were observed in turfgrass coverage and species transition. Since overseeding, the coverage was highest in PR, followed by TF and lowest in KB. The highest coverage in polystand was associated with Mixture IV (TF 50 + PR 50) at a seeding rate of $150gm^{-2}$ which had highest PR and TF, but without KB. Regarding turfgrass transition, zoysiagrass recovery continued to come back up to 80% from late March. But it reduced after early October. Zoysiagrass in monostand was greatest in KB and lowest in TF, but variable in polystand. For the fast and great coverage in winter, it would be the best to apply with PR at $100gm^{-2}$ and equal combination of PR and TF by 1/2 in the mixture at $150gm^{-2}$. For the smooth spring transition to zoysiagrass, however, KB application at $50gm^{-2}$ is recommended.

• Korean Journal of Weed Science
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• v.13 no.1
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• pp.26-35
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• 1993

Differences in weed occurrence was investigated among five types of rice (Oryza sativa L.) cultivation. The five types employed were three transplanting cultivations such as conventional hand transplanting, machine transplanting with 30-day-old seedling, and machine transplanting with 10-day-old seedling and two direct-seedings such as flood direct-seeded rice by pregerminated seed and dry direct-seeded rice by dry seed. Weed specie, occurred varied from 7 to 20, depending on the different cultivation types. Weeds were more diverse in transplanting with l0-day-old seedling than in other transplanting cultivations and in direct-seeding than in transplanting practice. Dominant weed species also varied with cultivation types. In transplanting cultivations Scirpus juncoides Roxb., Echinochloa crus-galli (L.) P. Beauv., and Eleocharis kuroguwai Ohwi were dominant, whereas occurrence of annual weeds such as Cyperus difformis L. and Monochoria vaginalis Presl. aside from the three weed species increased in direct-seeded cultivations.

• The Journal of the Korean bone and joint tumor society
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• v.20 no.2
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• pp.109-112
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• 2014

We experienced a case of 63 years old male patient who had synchronous rectus abdominis intramuscular schwannoma and chest wall lipoma. Schwannoma is rare benign tumor which derived from nerve sheath and mainly peripheral nerve of flexor part. The authors report rare synchronous schwannoma and lipoma development.

• The Journal of the Korean bone and joint tumor society
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• v.12 no.1
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• pp.89-94
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• 2006

When the old schwannoma has the degenerative changes, it is named as the ancient schwannoma which was rarely reported. The degenerative changes are perivascular hyalinization, calcification, cystic necrosis, marked decrease of Antoni type A area, and degenerative nuclei and the ancient schwannoma may be misinterpreted as sarcomatous pleomorphisms. We experienced the ancient schwannoma which has massive hemorrhage and hematoma, cystic change, calcification, and marked decrease of Antoni A area in leg on 75 year old male patient, and report it.

• Korean Journal of Weed Science
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• v.4 no.2
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• pp.211-218
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• 1984

In order to establish the chemical weed control systems in orchard, field experiments were conducted to evaluate the effects of spray methods and mixing of herbicides. The mixtured dosage of glyphosate 100cc/10a and 2,4-D 75㏄/10a showed higher control effects than mono-treatment of glyphosate and paraquat on Artemisia vulgaris var. indica and Polygonum hydropiper L. And oxyfluorfen was more effective in reducing the cover rate and dry weight of weeds than simazine and alachlor on 75th day after treatment. In the mixing experiment of land and foliar appling herbicides. The effect of glyphosate on May 17 followed by oxyfluorfen on June 12 showed the best control effect.

• Journal of The Korean Society of Grassland and Forage Science
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• v.23 no.3
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• pp.187-192
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• 2003

This study was conducted to investigate dry matter yield and quality of six turf grasses, and thus to apply its result into making mixed species in the mixtures. The six turf grasses were Kentucky bluegrass(Newport), red fescue(Salem), creeping bentgrass(Crenshaw), perennial ryegrass(Palmer Ⅱ), tall fescue(Rebell Jr.) and redtop(Barricuda). This experiment was carried out for 3-years at grassland experimental field of Chungnam National University. The dry matter(DM) yield obtained in tall fescue and redtop was higher than those of the other species(p<0.05). Consideration of crude protein content and dry matter digestibility(DMD), the species of high quality compared to the other species were creeping bentgrass, perennial ryegrass, and Kentucky bluegrass. The crude protein dry matter yield was higher in Kentucky bluegrass and redtop, it was lower in red fescue(p<0.05). On the other hand, digestible dry matter(DDM) yield was higher in tall fescue and redtop, but lower in creeping bentgrass and red fescue(p<0.05). Based on the result mentioned above, therefore, it is suggested that turf grasses such as tall fescue, Kentucky bluegrass and redtop are recommended as species of turf grass which could be used as bottom grasses in mixtures.

• Journal of the Korean Society of Radiology
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• v.82 no.1
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• pp.194-200
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• 2021

Schwannomas originate from Schwann cells, and they are the most common benign neoplasms of the peripheral nerves. They can occur in most parts of the body but have a predilection for the head, the neck, and the flexor aspects of the extremities. Pancreatic schwannomas are uncommon, and only a few cases have been reported in the English literature. Approximately two-thirds of pancreatic schwannomas undergo cystic degeneration, and they should be considered in the differential diagnosis of solid pancreatic tumors with cystic changes to facilitate accurate diagnosis and optimal treatment. We report a case of a pathologically proven schwannoma in the pancreatic tail with multiple cystic and hemorrhagic changes followed by a review of relevant literature.

• Korean Journal of Head & Neck Oncology
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• v.25 no.2
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• pp.143-145
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• 2009

신경초종은 전신의 말이집신경 중 어디에서나 발생할 수 있는 말초신경집 양성종양이다. 이 종양이 비강에서 발생하는 것은 흔하지 않다. 저자들은 뇌경색으로 입원하고 있던 55세 여자환자에서 다량의 비출혈을 동반한 비강 신경집종 1예를 보고하는 바이다. 부비강 컴퓨터단층촬영사진상 좌측비강과 비인두를 채우는 비균질한 저음영의 거대 종양이 관찰되었고 뼈의 재형성 역시 관찰되었다. 내시경 생검을 시행하였다. 병리검사상, 난원형의 경계가 좋은 병변이 편평상피로 화생된 비강 점막 아래에서 관찰되었고, 종양은 물결모양의 핵을 가진 방추세포로 이루어져 있었고, 방추형의 핵들이 밀집하게 모여있는 Antoni A 부분과 세포의 수가 적으며 허술하게 뭉쳐있는 Antoni B 부분으로 이루어져 있었으며 S-100 단백질 면역염색에 양성이었다. 비강의 신경초종으로 진단하였다. 따라서, 흔하지 않게 접하게 되는 비강 신경초종의 임상양상, 감별진단, 및 치료에 대해 알아보고자 한다.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1981.05a
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• pp.11.1-11
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• 1981

Neurilemmoma is a benign tumor which arises generally from the Schwann's cells. It is a slowly growing tumor and treated as surgically. We experienced a case of neurilemmoma of the oropharynx in a 28-year-old female who had noticed a gradual swelling of the left side of the oropharynx with swallowing difficulty for 6 months. The tumor was removed successfully intra-orally under the general endotracheal anesthesia and verified pathologically as neurilemmoma.