• Proceedings of the KOR-BRONCHOESO Conference
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• 1993.05a
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• pp.104-104
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• 1993

Fine needle aspiration cytology(FNAC) is a valuable method in preoperative diagnosis of thyroid nodule. Authors evaluated one hundred and ten thyroid nodules by FNAC compared with the postoperative histopathologic diagnosis during the period from Jan. 1, 1989 through Dec. 31, 1992. The results were as followed. The sensitivity was 86.5%, specificity 90.4%, false-negative rate 13.5%, false-positive rate 9.6%, positive predictability 91.5%, negative predictability 60.1% and overall diagnostic accuracy 87.3 %.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1983.05a
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• pp.5.3-5
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• 1983

Esophageal stricture due to various caustic agents has led to decrease markedly with the improvement of the way of life and socioenvironmental change, and can be prevented with adequate procedure and management. However, there are still sporadic incidents of esophageal stricture due to inadequate treatment and uncooperation of patients. Esophageal stricture was treated with various kinds of bougies ; peroral esophagoscopic bougie, Hurst or Maloney type weighted bougie, endless bougie, retrograde esophageal bougie and open surgery. Recently the authors had experienced a case of severe esophageal stricture after ingestion of HCl, which was treated by gastrostomy and endless bougienage with good result.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1981.05a
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• pp.13.3-13
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• 1981

Osteoma is the most common benign tumor originating in the paranasal sinuses and the frontal sinus is the most frequent site of osteoma of paranasal sinuses. Osteoma may occur at any age but the most frequent incidence is the third decade and those are histologically classified as compact, cancellous and mixed type. Recently, the authors have seen a patient with exophthalmos and downward displacement of eyeball due to a huge osteoma in the left frontal sinus which was removed by osteoplastic operation of the frontal sinus and the frontal sinus defect was implanted with adipose tissue from the patient own left abdomen. We report this case with review of the literature.

• Korean Journal of Bronchoesophagology
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• v.14 no.2
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• pp.70-72
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• 2008

Nerogenic tumor of various histologic types may arise in the posterior mediastinum. Mediastinal schwannoma is a frequent paraspinal neurogenic tumor, but malignant mediastinal schwannoma is rare tumor which is derived from Schwann cells. Although there are some reports dealing with approach for screening patients with symptoms suggesting malignancy and the imaging criteria for distinguishing malignant from benign schwannoma but the results are not clearly defined. We present a case of hugh mediastinal schwannoma which was taken for malignancy in imaging studies because of its invasiveness.

• Korean Journal of Head & Neck Oncology
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• v.32 no.2
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• pp.29-33
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• 2016

A 65-year-old male visited hospital in the state of tracheostomal recurrence 1 year after total pharyngolaryngectomy. Extensive recurrence around stoma or paratracheal, superior mediastinal area is challenging in treatment, especially in securing airway. We performed mediastinal tracheotomy through resection of unilateral manubrium, some part of sternal side of clavicle and $1^{st}$ rib as the salvage operation for recurrent laryngeal cancer. This procedure could be risky, thus very careful patient selection is required because of a tortuous postoperative course. We would like to present the case that anterior mediastinal tracheostomy could be needed as appropriate palliative means of airway construction in the patients with recurrent laryngeal cancer with lower neck extension with literature review.

• Korean Journal of Bronchoesophagology
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• v.3 no.1
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• pp.101-108
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• 1997

Hypothyroidism is not uncommon complication of therapy for head and neck cancer. A series of 52 patients treated with either radiotherapy alone or combined with surgery was retrospectively studied. Diagnostic procedure included total T3, T4 and TSH measured by radioimmunoassay. The rate of hypothyroidism was 25% (subclinical 15.4%, clinical 9.6%). The incidence of hypothyroidism increased to 40% when radiotherapy was combined with surgery. Risk factors influenced a high incidence of hypothyroidism were : tumor stage, primary tumor site, combination of radiotherapy and surgery (especially combined with laryngectomy). We advocate routine monitoring of head md neck cancer patients for hypothyroidism after treatment and recommend levothyroxine replacement therapy for subclinical hypothyroidism.

• Korean Journal of Bronchoesophagology
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• v.15 no.1
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• pp.24-27
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• 2009

Background: Benign tumors of the esophagus are rare. They include leiomyomas, gastrointestinal stromal tumors, neurofibromas and lipomas. In this study we present our experience with enucleation of these 13 tumors for 10 years. Material and Method: A retrospective review of patients who underwent enucleation of benign esophageal tumors between 1995 and 2005 was conducted. Symptom, tumor location and size, operative approach and outcomes after surgery were recorded. Result Thirteen patients were identified(leiomyoma: n=12; GIST n=l). Eight patients were men, five patients were women. Most of them were 4rd and 5th decade. The tumors arose in the lower(7 patients) and middle(6 patients) thirds of the esophagus. Eleven patients underwent a thoracotomy; the remainder were resected using VATS. All of patients underwent simple enucleation. There were no complications and recurrences after surgery. Conclusion: We present our experience with enucleation of these 12 leiomyomas and one GIST for 10 years.

• Journal of Korean Society of Forest Science
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• v.98 no.6
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• pp.696-702
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• 2009

Yellow poplar (Liriodendron tulipifera L.) is an insect-pollinated tree species with large, perfect flower, and its seed sets average only about 10 percent naturally. In its controlled pollination, pollination bags are usually taken to prevent unwanted pollination, but bagging is an expensive and time-consuming process. Therefore, this study was conducted to determine the need of pollination bag by estimating how much unintended pollination would occur when different cross methods were applied. Five different pollination methods were applied as follows: 1) natural open pollination (i.e. insect pollination) as a reference, 2) self-pollination; no removing reproductive organs with bagging, 3) open pollination; emasculated(removing sepal, petal and stamen) without bagging, 4) controlled pollination; emasculated with bagging and 5) controlled pollination; emasculated without bagging. Very low value of full seed rate (0.2%) was observed in method 3, it was suggested that removing stamen and petal restrict the activity of pollen vectors like bee. Difference in the full seed rate between method 4 and method 5 was not significant (27.9% versus 24.0%, respectively). Consequently, controlled pollination without bagging might be an alternative method for extensive breeding and mass production of seeds in yellow poplar.

• Journal of Chest Surgery
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• v.37 no.4
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• pp.349-355
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• 2004

Non-small cell lung cancer (NSCLC) with invasion of mediastinal structures is classified as stage IIIB, and has been considered surgically unresectable However, in a selected group of these patients, better results after surgical resection compared to non-surgical group have been reported. The aim of this study is to evaluate the role of surgical resection in treatment of mediastinal T4 NSCLC. Material and Method: Among 1067 patients who underwent surgical intervention for non-small cell lung cancer from Aug 1987 to Dec 2001 in Korea cancer center hospital, 82 patients had an invasion of T4 mediastinal structures (7.7%). Resection was possible in 63patients (63/82 resectability 76.8%). Their medical records in Data Base were reviewed, and they were followed up completely until Jun 2002. Surgical results and prognostic factors of NSCLC invading mediastinal structures were evaluated retrospectively. Result Lung cancer was resected completely in 52 patients (63.4%, 52/82). Lung resection was lobectomy (or more) in 14, pneumonectomy in 49. The mediastinal structures invaded by primary tumor were great vessel (61.9%), heart (19%), vagus nerve (9.5%), esophagus (7.9%), and vertebral body (7.9%). Nodal status was N0 in 11, N1 in 24, and N2 in 28 (44.4%). Neoadjuvant therapy was done in 6 (9.5%, 5 chemotherapy, 1 radiotherapy), and adjuvant therapy was added in 44 (69.8%, 15 chemotherapy, 29 radiotherapy) in resection group (n=63). Complication was occurred in 23 (31.7%), and operative mortality was 9.5% in resection group. Median and 5 year overall survival including operative mortality was 18.1 months and 21.7% in resection group (n=63), 6.2months and 0% in exploration only group (n=19, p=.001), 39 months and 32.9% in N2 (-) resection group (n=35), and 8.8 months and 8.6% in N2 (+) resection group (n=28, p=.007). The difference of overall survival by mediastinal structure was not significant. Conclusion: The operative risk of NSCLC invading mediastinal structures was high but acceptable, and long-term result of resection was favorable in selected group. Aggressive resection is recommended in well selected pateints with good performace and especially N2 (-) NSCLC with mediastinal invasion.

• Journal of Yeungnam Medical Science
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• v.24 no.2
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• pp.206-215
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• 2007

Background : The prone position is often used for operations involving the spine and provides excellent surgical access. The complications associated with the prone position include ocular and auricular injuries, and musculoskeletal injuries. In particular, the prone position during general anesthesia causes hemodynamic changes. To evaluate the cardiovascular effects of the prone position in surgical patients during general anesthesia, we investigated the effects on hemodynamic change of the prone position with the Jackson spinal surgery table. Materials and Methods : Thirty patients undergoing spine surgery in the prone position were randomly selected. After induction of general anesthesia, intra-arterial and central venous pressures (CVP) were monitored and cardiac output was measured by $NICO^{(R)}$. We measured stroke volume, cardiac index, cardiac output, mean arterial pressure, heart rate, CVP and systemic vascular resistance (SVR) before changing the position. The same measurements were performed after changing to the prone position with the patient on the Jackson spinal surgery table. Results : In the prone position, there was a significant reduction in stroke volume, cardiac index and cardiac output. The heart rate, mean arterial pressure and CVP were also decreased in the prone position but not significantly. However, the SVR was increased significantly. Conclusion : The degree of a reduced cardiac index was less on the Jackson spinal surgery table than other conditions of the prone position. The reduced epidural pressure caused by free abdominal movement may decrease intraoperative blood loss. Therefore, the Jackson spinal surgery table provides a convenient and stable method for maintaining patients in the prone position during spinal surgery.