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남인출,이예다운,김승호,윤정희,백혜진,이광희,남경한 대한영상의학회 2015 대한영상의학회지 Vol.72 No.5
Schwannomas are benign mesenchymal spindle cell tumors arising from the Schwann cells that form the peripheral neural sheath. Several recent studies indicate that although reports of gastrointestinal schwannomas have increased with advanced technological developments in immunohistochemical staining, isolated colonic schwannomas are extremely rare. Moreover, it is known to be somewhat difficult to diagnose colonic schwannoma before surgical operation. In this paper, we report a case of isolated schwannoma that was incidentally discovered in the ascending colon, along with a review of few recent literatures.
엄미리,안세원,이예리,이다운 대학교육개발센터협의회 2022 대학 교수-학습 연구 Vol.15 No.4
본 연구는 국내 MOOC에 대한 질적 개선 및 해외 MOOC 플랫폼으로의 진입·성장을 위한 초석 연구로서, 국내외 MOOC 특성을 비교하고, 수강 과정에서 느낀 학습자의 학습경험에 대해 내용분석을 하였다. 연구수행을 위해 모니터링단을 모집·선정하여 인문계열 유사내용을 다루는 국내 MOOC 2개 강좌와 해외 MOOC 2개 강좌를 동시에 수강하며 주차별 모니터링 활동보고서를 매주 정기적으로 작성하게 하였다. 연구결과 도출을 위해 모니터링 활동보고서의 내용을 분석하는 것은 물론 분석한 내용의 재확인 및 구체적인 의견을 파악하고자 구조화 및 비구조화 인터뷰를 실시하였다. 학습자가 느낀 학습경험을 통해 국내외 MOOC에 대한 다양한 측면에서의 공통점과 차이점을 탐색하였고, 국내 MOOC의 활성화 및 글로벌화를 위한 시사점을 도출하였다.
조성재,김승호,박상준,이예다운,손정희 대한영상의학회 2021 대한영상의학회지 Vol.82 No.2
Purpose To evaluate the association between magnetic resonance imaging (MRI)-based texture parameters and Kirsten rat sarcoma viral oncogene homolog (KRAS) mutation in patients with non-mucinous rectal cancer. Materials and Methods Seventy-nine patients who had pathologically confirmed rectal nonmucinous adenocarcinoma with or without KRAS-mutation and had undergone rectal MRI were divided into a training (n = 46) and validation dataset (n = 33). A texture analysis was performed on the axial T2-weighted images. The association was statistically analyzed using the Mann-Whitney U test. To extract an optimal cut-off value for the prediction of KRAS mutation, a receiver operating characteristic curve analysis was performed. The cut-off value was verified using the validation dataset. Results In the training dataset, skewness in the mutant group (n = 22) was significantly higher than in the wild-type group (n = 24) (0.221 ± 0.283; -0.006 ± 0.178, respectively, p = 0.003). The area under the curve of the skewness was 0.757 (95% confidence interval, 0.606 to 0.872) with a maximum accuracy of 71%, a sensitivity of 64%, and a specificity of 78%. None of the other texture parameters were associated with KRAS mutation (p > 0.05). When a cut-off value of 0.078 was applied to the validation dataset, this had an accuracy of 76%, a sensitivity of 86%, and a specificity of 68%. Conclusion Skewness was associated with KRAS mutation in patients with non-mucinous rectal cancer.
Osmotic Demyelination Syndrome with Recent Chemotherapy in Normonatremic Patient: A Case Report
이성재,백혜진,정현경,김선정,이예다운,이광희,류지화,김홍대 대한영상의학회 2014 대한영상의학회지 Vol.71 No.5
Osmotic demyelination syndrome (ODS), an acquired demyelinating condition of the central pons and/or other regions of the brain, is frequently associated with rapid correction of hyponatremia. There are several reports of ODS in other clinical setting such as malnutrition, alcoholism, transplantation, malignancy, and chronic debilitating illness. However, cases of ODS associated with chemotherapy have not been frequently reported. Here, we describe a case of ODS in a normonatremic patient recently underwent chemotherapy for colon cancer. The diagnosis was confirmed by MRI showing a typical T2 hyperintensity in the central pons. This case suggests that ODS is not always associated with hyponatremia and that ODS can have a favorable clinical and radiologic prognosis.
이슬비,윤정희,김승호,이예다운,김숙정,임윤정,정현경,이진수 대한영상의학회 2016 대한영상의학회지 Vol.74 No.6
Idiopathic retroperitoneal fibrosis (RPF) is a rare disease entity and its etiology is uncertain. We report two similar cases which showed an uncommon presentation of idiopathic RPF. A 66-year-old woman and an 80-year-old man presented with incidental findings of left renal pelvic mass-like lesions. Computed tomography revealed a soft tissue density mass replacing the left renal pelvis, which was suspicious for renal pelvic cancer, and the diagnosis of idiopathic RPF was surgically confirmed. To the best of our knowledge, a few cases of idiopathic RPF presenting with features of a localized unilateral renal pelvic mass mimicking renal pelvic cancer have been reported.
남인출,이광희,류지화,김옥화,김승호,백혜진,이예다운,김태년,김미경,김선정,김성목 대한영상의학회 2015 대한영상의학회지 Vol.73 No.6
Purpose: To analyze three-dimensional (3D) volume and histogram of thyroid gland on neck computed tomography (CT) for patients with Hashimoto’s thyroiditis. Materials and Methods: A total of 121 subjects who underwent neck CT between March 2013 and February 2014 were included in this study. These subjects were divided into the following two groups: 1) control group (n = 76); 2) Hashimoto’s thyroiditis group (n = 45). Non-enhanced and contrast-enhanced CT images were obtained. On contrast-enhanced images, the 3D volume of thyroid gland was semi-automatically calculated. On CT histogram, attenuation number, mean, median, standard deviation (SD), and coefficient of variation (CV) of thyroid gland were calculated. These values were compared between the two groups. Results: Total 3D volume of thyroid gland was 14.9 ± 4.8 cm3 in the control group, which was significantly (p = 0.002) lower than that (19.2 ± 8 cm3) in the Hashimoto’s thyroiditis group. On CT histogram, the mean, median, SD, and CV of thyroid gland on non-enhanced images were 95.8, 99.3, 21.7, and 0.226, respectively, in the control group and 72.2, 72.6, 19.6, and 0.28 in the Hashimoto’s thyroiditis group (p < 0.05). Histogram parameters on contrast-enhanced images were not significantly (p > 0.05) different. Median at cut-off value of 83 revealed the largest Az value (Az: 0.905; 95% confidence interval: 0.837–0.951; sensitivity: 84.4%; specificity: 85.5%). Conclusion: The Hashimoto’s thyroiditis group had larger volume but lower CT attenuation number with more prominent parenchymal heterogeneity of thyroid gland than the control group.
Two Consecutive Levels of Unilateral Cervical Spondylolysis on Opposite Sides
류경화,김선정,김옥화,김승호,이광희,백혜진,이예다운,차윤기 대한영상의학회 2015 대한영상의학회지 Vol.73 No.3
Cervical spondylolysis, with or without spondylolisthesis, is a rare condition defined as a corticated cleft between the superior and inferior articular facets of the articular pillar. The defect occurs predominantly at C6, and is usually bilateral in up to two-thirds of cases. Multilevel involvement is uncommon, however, to date, no case of two consecutive levels of unilateral cervical spondylolysis on opposite sides has been reported. Here, we report a rare case of a patient affected by two consecutive levels of unilateral cervical spondylolysis at C5 and C6 on opposite sides in a 19-year-old male complaining of neck pain.