1.Computed tomography of cystic tumors of the mediastinum
Chong Hyun YOON ; Jung Gi IM ; Man Chung HAN
Journal of the Korean Radiological Society 1983;19(4):703-708
Authors retrospectively analyzed the CT findings of cystic tumors of the mediastinum in surgically confirmed13 cases at Seoul National University Hospital during the recent 3 years from August 1980 to August 1983. Theresults are as follows: 1. Among 13 cases, bronchogenic cyst and cystic teratoma were 4 cases respectively,pericardial cyst were 2 cases, and thymic cyst and cystic hygroma was 1 case respectively. 2. CT No. of 4bronchogenic cysts was in the range of 12-112 HU, 3 cases among them had thick-walled capsules. CT No. of 4 cysticteratomas was in the range of
Bronchogenic Cyst
;
Capsules
;
Diagnosis, Differential
;
Lymphangioma, Cystic
;
Mediastinal Cyst
;
Mediastinum
;
Retrospective Studies
;
Seoul
;
Teratoma
2.Modification of labeling index of basal cells of tongue epithelium and renal toxicity of cis-diamminedichloroplatinum in mice by diethyldithiocarbamate.
Geon CHOI ; Man Su KIM ; Chong Tae YOON ; Heung Man LEE ; Soon Jae HWANG
Korean Journal of Otolaryngology - Head and Neck Surgery 1993;36(5):877-883
No abstract available.
Animals
;
Cisplatin*
;
Ditiocarb*
;
Epithelium*
;
Mice*
;
Tongue*
3.Reconstruction of the lower leg with free latissimus dorsi myocutaneous flap.
Kyu Yoon LEE ; Yong Bae KIM ; Young Man LEE ; Soon Jae YANG ; Chong Sup PARK
Journal of the Korean Society of Plastic and Reconstructive Surgeons 1991;18(1):101-106
No abstract available.
Leg*
;
Myocutaneous Flap*
;
Superficial Back Muscles*
4.Double Pylorus : A case report.
Hak Chul KIM ; Sang Dae KIM ; Tae Jung CHUNG ; Kuk Hyun CHO ; Tae Hee LEE ; Chong Man YOON
Korean Journal of Gastrointestinal Endoscopy 1981;1(1):45-48
A 63 year-old man was admatted to our hospital because of dulI epigastralgia. Upper G-I series reveaied the generalized thickened, tortuous mucosal folds in the stomach and duodenal bulb, Two ovold large pits on the antrum were observed endoscopically, Tha relevant literatures on the subject were reviewed.
Humans
;
Middle Aged
;
Pylorus*
;
Stomach
5.Extracorporeal shock wave lithotripsy of intrahepatic stones with piezoelectric lithotriptor: in vitro study.
Byung Ihn CHOI ; Chong Hyun YOON ; Yong Hyun PARK ; Joon Koo HAN ; Yong Bum YOON ; Yong Moon SHIN ; Jin Q KIM ; Chu Wan KIM ; Man Chung HAN
Journal of the Korean Radiological Society 1992;28(3):399-406
This study was designed to investigate effectiveness of fragmentation during lithotripsy using 103 intrahepatic stones collected from 10 patients. Who had previously undergone biliary surgery. The size of each stones was measured and sonography was performed for the evaluation of the sonographic type of the stones. In vitro lithotripsy was performed on individual stones using piezoelectric lithotriptor to evaluate the fragmentation rate and average number of shock waves for fragmentation. Chemical analysis of each stone was done to determine chemical composition including calcium, bilirubin, and cholesterol. The size of the stones was from 5mm to 20 mm in diameter. Sonographic type I(echo of whole stone with posterior acoustic shadow) was 68, and type II(are-like strong surface echo of stone with clear posterior acoustic shadow) was 35 in number. The majority(78%) of stones I group 1 (5-9mm in diameter) showed sonographic type I characteristics, and 62% of stones in group 3(larger than 15mm in diameter) showed sonographic type Ii characteristics. There was a positive correlation between the size and sonographic type of stones. Fragmentation rates of stones were 100% in group 1. 71.9% in group 2 (10-15 mm in diameter), 43.8% in group 3. Respectively. Fragmentation rates of stones with sonographic type I and II were 91.2%, 65.7%. respectively. The average number of shock waves for partial and complete fragmentation was 2753±4937 and 6219±10133. Respectively. There was a positive correlation between the number of shock waves for fragmentation and diameter of stones (r=0.618. p<0.05). There was no correlation between the number of shock waves for fragmentation and chemical composition of stones. In conclusion, the most important variable determining the degree of fragmentation of intrahepatic stones using ESWL is not their chemical composition but their size and sonographic characteristics.
Acoustics
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Bilirubin
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Calcium
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Cholesterol
;
Humans
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In Vitro Techniques*
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Lithotripsy*
;
Shock*
;
Ultrasonography
6.A three-dimensional finite element analysis of molar distalization with a palatal plate, pendulum, and headgear according to molar eruption stage.
Ju Man KANG ; Jae Hyun PARK ; Mohamed BAYOME ; Moonbee OH ; Chong Ook PARK ; Yoon Ah KOOK ; Sung Seo MO
The Korean Journal of Orthodontics 2016;46(5):290-300
OBJECTIVE: This study aimed to (1) evaluate the effects of maxillary second and third molar eruption status on the distalization of first molars with a modified palatal anchorage plate (MPAP), and (2) compare the results to the outcomes of the use of a pendulum and that of a headgear using three-dimensional finite element analysis. METHODS: Three eruption stages were established: an erupting second molar at the cervical one-third of the first molar root (Stage 1), a fully erupted second molar (Stage 2), and an erupting third molar at the cervical one-third of the second molar root (Stage 3). Retraction forces were applied via three anchorage appliance models: an MPAP with bracket and archwire, a bone-anchored pendulum appliance, and cervical-pull headgear. RESULTS: An MPAP showed greater root movement of the first molar than crown movement, and this was more noticeable in Stages 2 and 3. With the other devices, the first molar showed distal tipping. Transversely, the first molar had mesial-out rotation with headgear and mesial-in rotation with the other devices. Vertically, the first molar was intruded with an MPAP, and extruded with the other appliances. CONCLUSIONS: The second molar eruption stage had an effect on molar distalization, but the third molar follicle had no effect. The application of an MPAP may be an effective treatment option for maxillary molar distalization.
Crowns
;
Finite Element Analysis*
;
Molar*
;
Molar, Third
7.A study on microangiography of induced breast carcinoma in rats (I)
Sang Hoon BAE ; Chung Kie IM ; Byung Ihn CHOI ; Chong Hyun YOON ; Kyung Whan KO ; Sung Whan HA ; Man Chung HAN
Journal of the Korean Radiological Society 1984;20(3):366-370
Microangiography is a very effective method in evaluating morphological changes of small vessels not onlybecause it shows subtle changes in microvasculature but also shows whole length of the vessels. Reccently many experimental studies on microagniography of normal and injured tissues are reported, but there's no report on microangiography of artificially induced cancer tissue. Authors artificially induced breast carinoma in rats withintravenous infusion of carcinogenic substance, N-methyl-N-Nitrosourea, and microangiography was done to evaluate vascularity and morphological changes of vessels of the cancer tissue. The results are as follows; 1.Distribtution of the tumor vessels showed tendency to form bolules. 2. Overall tumor vascularity was slightly hypervascular. 3. Variable sized, parallell arraged, tumor vessels surrounded the boundary of the lobules whilemore small vessels invaginated to the center of lobules in tortuous or straight fashion. 4. In overall, peripherayof the lobule was more vascular than center. 5. There was no evidence of cental tumor necrosis, and findings of extravasation of dye or venous lake formation were minimal. 6. Pathologically, the tumor tissue was well differentiated adenocarcinoma with tendency of lobule formation.
Adenocarcinoma
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Animals
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Breast Neoplasms
;
Breast
;
Lakes
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Methods
;
Methylnitrosourea
;
Microvessels
;
Necrosis
;
Rats
8.Treadmill Exercise Stress Echocardiography in Patients With No History of Coronary Artery Disease: A Single-Center Experience in Korean Population.
Jeong Yoon JANG ; Il Suk SOHN ; Jong Nim KIM ; Jeong Hwan PARK ; Chang Bum PARK ; Eun Sun JIN ; Jin Man CHO ; Chong Jin KIM ; Jong Hoa BAE
Korean Circulation Journal 2011;41(9):528-534
BACKGROUND AND OBJECTIVES: Treadmill exercise stress echocardiography (TSE) has superior diagnostic accuracy than exercise electrocardiography (ECG). The objectives of the study are 1) to define the diagnostic accuracy and safety of TSE in patients without a history of coronary artery disease (CAD), 2) to identify the clinical characteristics that predict positive TSE results and 3) to assess the differential predictive value between TSE and concomitant exercise ECG in a Korean population. SUBJECTS AND METHODS: A total of 1,287 patients among 1,500 consecutive patients with no prior history of CAD and who were referred for TSE during a 4-year 3-month period were enrolled. RESULTS: Of the 1,287 patients, 95 (7.4%) showed positive TSE results (newly developed regional wall motion abnormality). Among the 154 patients with coronary angiography, 94 patients (61%) showed significant CAD (30 of 77 patients with negative TSE results and 64 of 77 patients with positive TSE results). The TSE positive population had more cardiovascular risk factors and showed a higher Duke treadmill score and wall motion score index than the TSE negative group. TSE showed relatively good sensitivity (68%), specificity (78%) and positive and negative predictive values (83% and 61%, respectively), and TSE also had higher diagnostic accuracy than concomitant exercise ECG (72% vs. 64%, respectively). CONCLUSION: TSE is safe and offers greater diagnostic power for CAD than exercise ECG in Korean population without a history of CAD. Its prognostic value in this population needs to be confirmed in a larger prospective study.
Coronary Angiography
;
Coronary Artery Disease
;
Coronary Vessels
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Echocardiography, Stress
;
Electrocardiography
;
Exercise Test
;
Humans
;
Risk Factors
;
Sensitivity and Specificity
9.The clinicopathological relationship of E2F-1 and Ki-67 expression in endometrial cancer.
Hye In CHONG ; Yun Ji BAEK ; Ho Jin JANG ; Dong Soo SUH ; Man Soo YOON ; Kyung Un CHOI
Korean Journal of Obstetrics and Gynecology 2009;52(2):228-236
OBJECTIVE: The aim of this study was to evaluate the correlation of E2F-1 and Ki-67 expression with clinicopathological prognostic factors. METHODS: Retrospectively, endometrial cancer slide samples (n=71) were analyzed. E2F-1 and Ki-67 were evaluated using immunohistochemical staining. And as a control (n=21), endometrial tissues were obtained by hysterectomy with benign gynecologic disease. RESULTS: Of 71 cases, the positive E2F-1 expression was 53.5% (38/71) in endometrial cancer. The expression of E2F-1 showed a remarkable positive correlation with myometrial invasion (P=0.001) and lymphovascular invasion (P=0.000). The Ki-67 labeling index was 30.56+/-25.67 in endometrial cancer and 9.38+/-8.35 in normal endometrial tissues (P=0.001). The Ki-67 labeling index showed positive correlations with increased tumor size (P=0.046, gamma=0.238), positive lymph node metastasis (P=0.001, gamma=0.396), cervical invasion (P=0.000, gamma=0.404) and lymphovascular tumor invasion (P=0.000, gamma=0.597). There was a positive correlation between E2F-1 and Ki-67 expression (P=0.000, gamma=0.734). CONCLUSION: The Ki-67 expression seems to be related with tumor invasiveness and growth in endometrial cancer and shows a remarkable positive correlation with E2F-1. The E2F-1 expression seems to be not related as a direct prognostic factor but related with tumor invasiveness and growth in endometrial cancer.
Endometrial Neoplasms
;
Female
;
Hysterectomy
;
Lymph Nodes
;
Neoplasm Metastasis
;
Retrospective Studies
10.The clinicopathological relevance for the expression of cyclin E, CDK2, and p27 in endometrial carcinoma.
Yun Ji BAEK ; Hye In CHONG ; Ho Jin JANG ; Dong Soo SUH ; Man Soo YOON ; Kyung Un CHOI
Korean Journal of Obstetrics and Gynecology 2008;51(10):1112-1120
OBJECTIVE: The aim of this study was to evaluate the clinicopathological relevance for the expression of cyclin E, CDK2 and p27 in endometrial carcinoma. METHODS: With a retrospective review, slide samples (n=71) were analyzed. All patients had been treated with hysterectomy from January 1998 to December 2006. The expression of cyclin E, CDK2 and p27 were analyzed using immunohistochemical staining. RESULTS: Of 71 cases, the positive expression was cyclin E; 28 cases (39.4%), CDK2; 29 cases (40.8%). The expression of cyclin E showed positive correlation with lymph node metastasis (P=0.033) and estrogen receptor. The expression of CDK2 showed positive correlation with estrogen receptor (P=0.000). The negative expression of p27 was 42 cases (59.2%) and showed no correlation with other clinicopathological factors. Cyclin E overexpression with loss of p27 expression showed positive correlation with advanced stage (P=0.002), lymphovascular invasion (P=0.030) and lymph node metastasis (P=0.002). CONCLUSION: Cyclin E overexpression with loss of p27 expression could be an useful negative prognostic factors for endometrial carcinoma.
Cyclin E
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Cyclins
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Endometrial Neoplasms
;
Estrogens
;
Female
;
Humans
;
Hysterectomy
;
Lymph Nodes
;
Neoplasm Metastasis
;
Retrospective Studies