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Epidermal inclusion cyst of the umbilicus in a child
( Sang-woo Park ),( Eui-sung Jung ),( Hyun-bin Kwak ),( Soo-kyung Park ),( Seok-kweon Yun ),( Han-uk Kim ),( Jin Park ) 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.1
Epidermal cyst is a common benign cutaneous tumor that predominantly occurs on the face, trunk, and neck, where hair follicles are present. The umbilicus is one of the rarest sites of epidermal cyst, and only a few umbilical epidermal cysts have been reported, primarily in adults. Herein, we report a rare case of umbilical epidermal cyst in a child, which should be included in the differential diagnosis of umbilical skin lesions. A 7-year-old girl visited us for an asymptomatic protruding nodule on her umbilicus that had gradually increased in size over three years. Physical examination showed a 0.8 cm × 0.8 cm pearly gray, spherical nodule in the umbilicus. Dermoscopy revealed shiny white structures with arborizing vessels on the surface of the nodule. Ultrasonography revealed a well-circumscribed cyst confined to the skin layer, but tubular structures penetrating into the abdominal cavity or connecting to internal organs were not seen. Histopathologic findings of the tissue from complete excision of the mass showed a cyst that is lined with stratified squamous epithelium with granular layer and containing keratins. No complication or recurrence was observed during the 6 months after tumor removal.
Adult xanthogranuloma: A clinical, pathological, and immunohistochemical study of 19 Korean cases
( Sang-woo Park ),( Eui-sung Jung ),( Hyun-bin Kwak ),( Soo-kyung Park ),( Kyung-hwa Nam ),( Jin Park ),( Seok-kweon Yun ),( Han-uk Kim ) 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.2
Background: Juvenile xanthogranuloma is a benign, self-limited disorder that usually occurs in infants and young children. However, it is rare in adults and there is a lack of study on adult xanthogranuloma. Objectives: To investigate the clinical, pathological, and immunohistochemical characteristics of adult xanthogranuloma. Methods: This study included 20 lesions from 19 patients with adult xanthogranuloma. Results: There was a male predilection (M:F=1.4:1), and mean age was 35.1±16.3 years (range 15~66 years), with the peak in the twenties. 65.0% of the lesions developed on the head and neck. The nodular form was more common than the papular form. Histological examination in 5 lesions (25.0%) revealed dense monomorphic histiocytic infiltration without lipidization and scattered eosinophils. There was also absence of multinuclear giant cells. 10 lesions (50.0%) had foamy histiocytic infiltration with variations of fully developed Touton giant cells. 3 lesions (15.0%) showed fibrohistiocytic proliferation. Histiocytes, including giant cells, were generally positive for FXIIIa (90.9%), vimentin (100%) and CD68 (100%). The CD1a, SMA and S-100 protein reactions were all negative. Tumor excision was the treatment for choice. Conclusion: This retrospective study has a small sample size and is limited to a single center, but we expect the results of this study to contribute to better understanding adult xanthogranuloma.
Sang-Gyun Kim,Ju-Hun Park,Han-Bin Park,Dong-Hwi Yoo,Won-Suk Jang,Won-Bin Shin,Kang-Eah Choi,Hyun-Woo Cho 대한침구의학회 2020 대한침구의학회지 Vol.37 No.4
Filum terminale lipoma is an inherited lumbosacral abnormality that can cause tethered cord syndrome. This report describes an unusual case of lumbago and sciatica, pain suspected to be caused by a filum terminale lipoma where a herniated intervertebral disc had occurred. The patient was hospitalized for 43 days and received integrative Korean medicine treatment, including acupuncture, pharmacopuncture, Chuna therapy, cupping therapy, physiotherapy and herbal medicine. Treatment effectiveness was assessed using the numerical rating scale, Oswestry Disability Index, European Quality of Life 5-Dimensions, and patient symptoms. After inpatient treatment, the pain the patient suffered was significantly reduced, and the evaluation indices scores reflected this. Integrative Korean remedies may be an effective option for lower back pain and lower extremity symptoms which are caused by filum terminale lipoma where a herniated intervertebral disc has occurred. Additional clinical research is required to support this observation.
Simulation and Prediction on the Performance of a Hydrogen Engine
Han, Sung Bin The Korean Society for Energy 2015 에너지공학 Vol.24 No.4
A computer simulation has been developed to predict and investigate the performance of the assumed hydrogen engine. The simulation has be come a powerful tool as it saves time and also economical when compared to experimental study. The effects of various parameters, such as equivalent ratio, spark advance, revolutions per minute were calculated and then the optimal parameters of assumed engine were determined. The effects of spark advance, revolutions per minute, cylinder pressure, rate of pressure rise, flame temperature, rate of heat release, and mass fraction burned were simulated. The objective of the research paper is to develop a internal combustion model with hydrogen as a fuel.
A case of cactus spine injury in a Korean woman
( Sang-woo Park ),( Eui-sung Jung ),( Hyun-bin Kwak ),( Soo-kyung Park ),( Jin Park ),( Han-uk Kim ),( Seok-kweon Yun ) 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.1
The cactus spines can easily puncture the skin with only minor pressure. Lodged cactus spines can cause pain due to mechanical irritation, be a source of infection, and result in foreign body granulomas. Only one case with cactus spine injury has been reported in Korea to date. We report this case for educational purposes because there is few report regarding cactus spine injury in Korea. A 17-year-old Korean girl presented for evaluation of multiple purple colored macules and papules on the left cheek and left first finger. Two months earlier, while on voluntary service in Haiti, she accidentally got hurt by cactus. She immediately went to the emergency room and removed the spine with tweezer. In the next 3 weeks, she developed painful lesions at the sites of penetration. An ultrasound was performed on the lesions and wedge shaped echogenic material suspected as cactus spine and granuloma formation were observed. Surgical removal with biopsy was recommended, but rejected by the patient and her mother. We administered conservative treatments with oral analgesics, anti-biotics, and anti-inflammatory drugs. After the conservative treatments, the patients symptoms have been improving gradually for over 6 months.
Changes in Diagnostic Methods for Pulmonary Tuberculosis between 2005 and 2013
( Bin Ahn ),( Joohae Kim ),( Chul Gyu Yoo ),( Young Whan Kim ),( Sung Koo Han ),( Jae Joon Yim ) 대한결핵 및 호흡기학회 2015 Tuberculosis and Respiratory Diseases Vol.78 No.3
Background: Diagnostic methods for pulmonary tuberculosis (TB) have recently advanced. The aim of this study was to evaluate the changes in TB diagnostic tests that prompted the initiation of anti-TB treatment over time in South Korea, an industrialized country with an intermediate TB burden. Methods: Patients diagnosed with pulmonary TB in the first halves of 2005 and 2013 at a tertiary referral hospital were included. Diagnostic methods that prompted the initiation of anti-TB treatment were compared between the 2 groups of patients. Results: A greater proportion of patients were diagnosed with pulmonary TB using bronchoscopy in 2013 than in 2005 (26.7% vs. 6.6%, respectively; p<0.001), while the proportion of patients clinically diagnosed with pulmonary TB was lower in 2013 than in 2005 (24.7% vs. 49.0%, respectively; p<0.001). Additionally, more patients started anti-TB treatment based on positive polymerase chain reaction (PCR) results for Mycobacterium tuberculosis DNA in 2013 than in 2005 (47.3% vs. 7.9%, respectively; p<0.001). Conclusion: The initiation of treatment for pulmonary TB in South Korea has become more frequently based on PCR and the use of bronchoscopic specimens.