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"Ji-Won Han"

Original Articles

[English]
A Comparative Study of Three National Surveys on Biliary Atresia by the Korean Association of Pediatric Surgeons
Yeon Jun Jeong, Dayoung Ko, Hyunhee Kwon, Ki Hoon Kim, Dae Yeon Kim, Soo-Hong Kim, Wontae Kim, Hae-Young Kim, Hyun Young Kim, Seong Chul Kim, Younghyun Na, Jung-Man Namgoong, So Hyun Nam, Junbeom Park, Jinyoung Park, Tae-Jun Park, Jeong-Meen Seo, Ji-Young Sul, Joonhyuk Son, Hyun Beak Shin, Joohyun Sim, Soo Min Ahn, Hee Beom Yang, Jung-Tak Oh, Chaeyoun Oh, Joong Kee Youn, Sanghoon Lee, Ju Yeon Lee, Kyong Ihn, Hye Kyung Chang, Eunyoung Jung, Jae Hee Chung, Yu Jeong Cho, Yun Mee Choe, Soo Jin Na Choi, Seok Joo Han, In Geol Ho, Ji-Won Han
Adv Pediatr Surg 2025;31(2):47-58.   Published online July 16, 2025
DOI: https://doi.org/10.13029/aps.2025.31.2.47
Purpose
Biliary atresia (BA) is a rare but progressive cholangiopathy and the leading cause of pediatric liver transplantation worldwide. The Korean Association of Pediatric Surgeons (KAPS) has conducted three national surveys (2001, 2011, and 2023) to assess long-term trends in the diagnosis, treatment, and outcomes of BA. This study provides a comparative analysis of the 2nd and 3rd national surveys, with reference to selected findings from the 1st survey.
Methods
This study included 453 patients from the 3rd national survey (2011–2021) and 435 patients from the 2nd survey (2001–2010), all of whom underwent Kasai portoenterostomy. Data were collected via electronic case report forms from pediatric surgical centers nationwide. Comparisons were made regarding demographics, clinical features, diagnostic patterns, operative details, follow-up outcomes, and survival. Kaplan–Meier analysis was used to evaluate long-term survival.
Results
The mean number of BA patients per year remained stable between surveys (43.5 in the 2nd, 41.18 in the 3rd), though centralization of care increased, with 61.5% of cases managed by two major institutions in the 3rd survey. The median age at surgery decreased, and the use of preoperative imaging (especially magnetic resonance cholangiopancreatography) increased. The 10-year native liver survival rate declined from 59.8% to 53.7%, while overall 10-year survival improved slightly (92.9% to 93.2%). Postoperative complications, such as cholangitis and liver failure, persisted but were better categorized. The 3rd survey also reported improved mortality (4.9%) and reduced follow-up loss (11.5%) compared to the 2nd survey.
Conclusion
While overall survival after Kasai operation has remained high and even improved, native liver survival has slightly declined. The findings reflect earlier diagnosis, more consistent diagnostic imaging, and increasing centralization of care. These trends underscore the importance of long-term nationwide data collection in guiding future strategies for BA management in Korea.
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[English]
Is Preoperative Ultrasonography Necessary in Pediatric Inguinal Hernia?
Ji-Won Han, Joong Kee Youn, Hee-Beom Yang, Chaeyoun Oh, Hyun-Young Kim, Sung-Eun Jung
J Korean Assoc Pediatr Surg 2018;24(1):5-9.   Published online June 30, 2018
DOI: https://doi.org/10.13029/jkaps.2018.24.1.5
Purpose

Preoperative ultrasonography (USG) in pediatric inguinal hernia has controversy. In this study, we analyzed the cases of pediatric inguinal hernia with/without preoperative USG and discussed whether USG is necessary.

Methods

We reviewed medical records of 1,441 patients who underwent inguinal hernia repair in Seoul National University Children's Hospital between January 2011 and August 2016 retrospectively.

Results

Male were 69.3% and age at operation was 37.8±36.5 months old. There were 150 patients (10.4%) performed USG preoperatively. The department ordered to perform USG included department of surgery (n=71), emergency medicine (n=42), pediatrics (n=26), urology (n=10) and outside hospital (n=1). The reasons of performing USG included evaluation for hernia laterality (n=82), incarceration (n=28), testis (n=15), request of parents (n=14), scrotal mass (n=6) and incidentally found during evaluation for another disease (n=5). Excepting 5 cases of incidental finding, of 145 cases with USG, 12 (8.3%) cases changed the surgical plan; change to bilateral repair from unilateral repair (n=5), emergency operation due to incarceration (n=4) which include 1 salpingo-oophorectomy, 1 open abdomen surgery and 2 hernia repair after reduction of ovary, change to co-operation of orchiopexy (n=2) and change to laparoscopic surgery from open surgery due to herniation of both ovaries into one inguinal canal (n=1). In group without USG (n=1,291), 5 patients (0.4%) had unexpected problems during operation; 2 co-operation of orchiopexy because of transverse testicular ectopia (n=1) and right undescended testis (n=1), 2 hypertrophy of major labia and 1 retroperitoneal lymphangioma at inguinal area misdiagnosed as inguinal hernia.

Conclusion

It was difficult to interpret the meaning of preoperative USG because not all patients had performed it. In this study, 10.4% of patients performed USG and 8.3% of them changed surgical plan. About 0.4% of patients without preoperative USG would have benefited from it for surgery if they had performed it. Since the percentage is too low, it is unreasonable to conclude that USG has diagnostic utility in inguinal hernia in this study.

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Case Reports

[English]
Transverse Colon Volvulus around the Gastrostomy Tube in a Pediatric Situs Inversus Patient
Yoon Hyung Kang, Joong Kee Youn, Ji-Won Han, Chaeyoun Oh, Sung-Eun Jung, Hyun-Young Kim
J Korean Assoc Pediatr Surg 2018;24(1):26-29.   Published online June 30, 2018
DOI: https://doi.org/10.13029/jkaps.2018.24.1.26

An 18-year-old male patient with cerebral palsy and scoliokyphosis came to the emergency department with abdominal distension and vomiting. He was a situs inversus patient with a feeding gastrostomy tube. Sigmoid volvulus was initially suspected, so rectal tube insertion and endoscopic decompression were attempted, but failed. So he went through explorative laparotomy, and transverse colonic adhesion and twisting around the gastrostomy tube and gastric wall was identified. Adhesiolysis and resection with redundant transverse colon and end-to-end colocolic anastomosis was performed. He discharged with symptom free. Suspecting transverse colonic volvulus is important when the patient has anatomical anomalies and feeding gastrostomy tube. Timely diagnosis with proper radiologic imaging should be made. Surgical resection of the redundant colon is needed for successful management of transverse colonic volvulus.

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[English]
A Case Report of Gardner-Associated Fibroma in 19-Month-Old Girl
Ho Lee, Ji-Won Han, Joong Kee Youn, Hyun-Young Kim
J Korean Assoc Pediatr Surg 2017;23(2):59-61.   Published online December 20, 2017
DOI: https://doi.org/10.13029/jkaps.2017.23.2.59

Gardner-associated fibroma (GAF) is a benign lesion of soft tissue which has recently been described and is exceedingly rare in children. GAF is associated with adenomatous polyposis coli gene mutation, familial adenomatous polyposis and desmoid. We report a case of patient with soft tissue tumor on her lower back which was turned out to be GAF. The patient was a 19-month-old female who visited out-patient clinic with palpable mass on her lower back and we performed surgical excision. The tumor was located at subcutaneous and we excised the tumor including surrounding soft tissue. She discharged without any complication on surgery day. The pathologic report showed dense collagenous tissue with spindle cell and adipose tissue, suggestive of GAF. We are planning to check gene study and to perform endoscopy and abdominal ultrasonography for at the age of 4.

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Original Articles

[English]
Thyroid Cancer in Pediatric Age: A Single Institution Experience
Hyo-Jun Kim, Ji-Won Han, Joong Kee Youn, Hee-Beom Yang, Chaeyoun Oh, Hyun-Young Kim, Sung-Eun Jung, Kwi-Won Park
J Korean Assoc Pediatr Surg 2017;23(2):42-47.   Published online December 20, 2017
DOI: https://doi.org/10.13029/jkaps.2017.23.2.42
Purpose

Thyroid cancer is a rare disease in pediatric population, but its incidence rate is increasing. The aim of this report is to present a single institution experience of pediatric thyroid cancer and to identify clinical features, predisposing factors, and postoperative course of pediatric thyroid cancer.

Methods

We retrospectively reviewed 35 pediatric patients who underwent operation due to thyroid cancer at Seoul National University Children's Hospital between May 1997 and January 2017. The median follow-up period was 70 months (range, 5–238 months).

Results

The mean age at operation was 12.0±5.91 years and 27 patients were female. The underlying conditions in patients included history of chemoradiotherapy for previous other malignancies (n=4), hypothyroidism (n=3), history of chemotherapy (n=2), family history of thyroid cancer (n=1) and history of radiation therapy (n=1). The initial symptoms were palpable neck mass (n=21) and incidental findings (n=11). Total thyroidectomy (n=30) or unilateral lobectomy (n=5) were performed. There were 15 postoperative complications including transient hypocalcemia in 14 patients and Horner's syndrome in 1 patient. The most common pathologic cell type was papillary thyroid cancer (n=29). Extrathyroid extension and lymph node invasion were found in 25 patients and 27 patients, respectively. Thirteen patients showed multifocality. During follow-up period, 5 patients underwent additional operation because of tumor recurrence in lymph nodes. Lung metastasis was detected in 3 patients at the time of diagnosis and in 3 patients during follow-up period. The mortality rate was zero and mean disease-free survival was 83.7±47.9 months.

Conclusion

Pediatric thyroid cancer has lower mortality rate and recurrence rate as seen in this study despite the advanced stage at diagnosis. A thorough follow-up of patients with an underlying condition such as history of chemoradiotherapy and understanding new pediatric guideline can be helpful to maximize patients' survival and prognosis.

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[English]
Early Experience of Pediatric Thoracoscopic Surgery Performed by a Pediatric Surgeon
Jong-Ho Cheun, Ji-Won Han, Joong Kee Youn, Hee-Beom Yang, Chaeyoun Oh, Hyun-Young Kim, Sung-Eun Jung
J Korean Assoc Pediatr Surg 2017;23(2):29-36.   Published online December 20, 2017
DOI: https://doi.org/10.13029/jkaps.2017.23.2.29
Purpose

Minimally invasive surgery (MIS) in abdomen and thorax has been widely accepted for pediatric diseases. Thoracoscopic surgery has the advantage of less pain, better cosmetic outcomes and less musculoskeletal sequelae in comparison to open surgery. We would like to share our initial experience with thoracoscopic surgery performed by one pediatric surgeon.

Methods

We performed a retrospective review of patients who underwent thoracoscopic surgery by one pediatric surgeon between April 2010 and August 2017 in Department of Pediatric Surgery, Seoul National University Children's Hospital.

Results

There were totally 18 cases; 8 cases for esophageal atresia, 3 cases for congenital diaphragm hernia, 2 cases for diaphragm eventration, 2 cases for esophageal duplication cyst, 2 cases for pleural mass and 1 case for esophageal bronchus. At the operation, median age was 9.5 months (range, 0-259 months) and median body weight was 9.4 kg (range, 1.9-49.4 kg). Median operative time was 157.5 minutes (range, 45-335 minutes). There was no case of open conversion and 2 cases of minor leakage at anastomosis site in case of esophageal atresia. Median follow-up month was 5 months (range, 0-87 months). During follow-up, 4 cases of esophageal atresia showed anastomosis site narrowing and average 2.5 times (range, 1-5 times) of esophageal balloon dilatation was done.

Conclusion

We performed thoracoscopic surgery in case of esophageal, diaphragm disease and pleural mass. Thoracoscopic surgery can be an effective and feasible option of treatment for well-selected pediatric patients of intra-thoracic disease including esophagus, diaphragm and mediastinum disease.

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Case Reports

[English]
Esophageal Atresia with Bronchogenic Cyst
Youngmin Kim, Chaeyoun Oh, Joong-Kee Youn, Ji-Won Han, Hyun-Young Kim, Sung-Eun Jung
J Korean Assoc Pediatr Surg 2017;23(1):5-8.   Published online June 26, 2017
DOI: https://doi.org/10.13029/jkaps.2017.23.1.5

A baby was diagnosed with esophageal atresia (EA) with tracheoesophageal fistula (TEF) on the next day after birth, and end-to-end anastomosis of esophagus with TEF ligation was performed. The distance between proximal and distal esophageal pouch was checked as 3 vertebral body lengths and a 1 cm-sized bronchogenic cyst (BC) was identified near carina on the right side, just below the proximal esophageal pouch. This case report described the baby who have a BC was located between the both esophageal pouch and a longer esophageal gap than usual EA with distal TEF.

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[English]
A Case of Extramedullary Hematopoiesis Associated with Congenital Dyserythropoietic Anemia
Won-Ho Han, Chaeyoun Oh, Ji-Won Han, Joong-Kee Youn, Hyun-Young Kim, Sung-Eun Jung
J Korean Assoc Pediatr Surg 2017;23(1):1-4.   Published online June 26, 2017
DOI: https://doi.org/10.13029/jkaps.2017.23.1.1

It has been known that extramedullary hematopoiesis occurring after birth can be developed in various diseases, and it is often found in hematologic diseases. Among these, congenital dyserythropoietic anemia is a rare disease characterized with increase of ineffective hematopoiesis and morphological abnormalities of erythroblasts. In congenital dyserythropoietic anemia, extramedullary hematopoiesis is very rare and only a few cases have been reported. Although treatment is not required if there is no symptom in extramedullary hematopoiesis, surgery or radiation therapy is effective in case that there is symptom or unresponsive anemia despite blood transfusion. This case report is about surgical treatment for extramedullary hematopoiesis in 23-year-old patients diagnosed of congenital dyserythropoietic anemia.

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[English]
A Case of Pediatric Nodal Marginal Zone Lymphoma
Byunghun Min, Joong Kee Youn, Ji-Won Han, Chaeyoun Oh, Hyun-Young Kim, Sung-Eun Jung
J Korean Assoc Pediatr Surg 2016;22(2):59-62.   Published online December 22, 2016
DOI: https://doi.org/10.13029/jkaps.2016.22.2.59

Lymph node enlargement is a common finding in children suggesting normal or benign. Palpable nodes which are large, hard or fixed must be examined carefully to rule out malignant diseases. In this case, a 15-year-old boy presented to our hospital to inspect the palpable mass at his post-auricular area being found 2 months ago. It was diagnosed as nodal marginal zone lymphoma (NMZL) through excisional biopsy and immunohistochemistry. NMZL is very rare, especially in children and young adults, but occurs locally in most cases with a good prognosis compared to adults. We described a rare case of NMZL diagnosed in adolescent.

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Original Article

[English]
Trend of Pediatric Cholecystectomy: Clinical Characteristics and Indications for Cholecystectomy
Wonho Han, Chaeyoun Oh, Joong Kee Youn, Ji-Won Han, Jaeik Byeon, Soohong Kim, Hyun-Young Kim, Sung-Eun Jung
J Korean Assoc Pediatr Surg 2016;22(2):42-48.   Published online December 22, 2016
DOI: https://doi.org/10.13029/jkaps.2016.22.2.42
Purpose

Number of pediatric cholecystectomy has been recently showing a gradually increasing trend. The purpose of this study was to investigate the clinical features of patients who underwent pediatric cholecystectomy, and the latest trend in cholecystectomy.

Methods

In the present study, we conducted a retrospective chart review on 47 patients who had undergone cholecystectomy at a single center. The entire patient population was divided into two groups, according to the time of cholecystectomy (early group, January 1999 to December 2006; late group, January 2007 to August 2014).

Results

The comparison between the early and late groups showed that the number of cholecystectomy increased from 13 to 34 cases representing a 2.6-fold increase. The mean patient age also increased from 5.94±4.08 years to 10.51±5.57 years (p=0.01). Meanwhile, laparoscopic surgery also increased from 15.4% to 79.4%, respectively (p<0.001). However, sex, mean body mass index, comorbidities, indications of cholecystectomy, and previous total parenteral nutrition were not statistically significant.

Conclusion

The results of this study showed that pediatric cholecystectomy cases are increasing, particularly in the 10 to 19 years age group and laparoscopic cholecystectomies are also being performed at an increasing rate. When the patients were compared according to the time of cholecystectomy, there were no differences in other risk factors or indications for cholecystectomy.

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