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A case of cutaneous sarcoidosis in tattoo scar
( Bo Ram Kwon ),( Min Jung Choi ),( Hae Young Choi ),( You Won Choi ),( Min Young Lee ),( Ji Yeon Byun ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Tattooing can be complicated from infection to granulomatous diseases. Especially sarcoidal granuloma may cause atypical mycobacterial infection, foreign body granuloma, and sarcoidosis. A 66-year-old Korean female presented with erythematous tender crusted patches on the eyebrows and eyelids tattooed several years ago, with multiple nodules on glabella and forehead. The skin lesions occurred 3 month ago and there was several palpable masses and lymph nodes on bilateral neck. Histologically multiple naked granulomas scattered in the whole dermis surrounded by prominent reticulin fibers, while black tattoo granules were located only in the upper dermis. A few gram-positive cocci were found in parakeratotic follicular plugging. There was no AFB positive or PAS positive microorganisms. In additional studies, staphylococci were cultured in tissue and ACE increased as 80[normal range is from 12 to 68]. As a result, the patient was diagnosed with sarcoidosis accompanied by staphylococcal folliculitis. She received oral steroid and steroid intralesional injection and showed improvement. Herein, we report a case of cutaneous sarcoidosis in tattoo scar and expect that this case can emphasize the possibility of recalling sarcoidosis in granulomatous reaction of tattoo scar when histologic feature showed a foreign body and naked granuloma together.
A case of apocrine hidrocystoma on back
( Bo Ram Kwon ),( Min Jung Choi ),( Ji Yeon Byun ),( You Won Choi ),( Hae Young Choi ) 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.1
Apocrine hidrocystoma is benign cystic neoplasm of the secretory segment of apocrine sweat glands. Generally it occurs in middle-aged woman, as a solitary asymptomatic smooth skin colored papule. The usual location is on face, but occasionally on ear, scalp, chest and vulva. Clinically and histologically apocrine hidrocystoma resemble eccrine hidrocystoma. But unlike eccrine hidrocystoma, it does not relate to temperature. A 59-year-old male presented one asymptomatic bluish nodule on back. The papule tended to expand over time. Histologic examination revealed multilobular thin-walled cyst lined by columnar epithelium with decapitation secretion. Secretory epithelium was positive for gross cystic disease fluid protein 15 stain and contained periodic acid-schiff stain positive cytoplasmic granules. As a result, the patient was diagnosed with apocrine hidrocystoma. It is extremely rare for apocrine hidrocystoma developing on back. Herein, we report a case of apocrine hidrocystoma which developed in an unusual location.
Analysis of positive rates for standard allergens of patch test in Korea with literature review
( Bo Ram Kwon ),( Min Young Lee ),( Ji Yeon Byun ),( You Won Choi ),( Hae Young Choi ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.2
Background: Korean standard series (KSS) have no change for 20 years. Moreover, the Korea Food and Drug Administration has suspended import licensing of Cosmetic series(ChemotechiniqueⓇ) Objectives: To analyze trends in the positive rates of allergens in KSS and to compare the results to those using European baseline series(EBS) and North American Contact Dermatitis Group(NACDG) screening series through literature review. Methods: Positive rate of KSS allergens were analyzed from the contact dermatitis patients who visit the department of dermatology in Ewha Womans University Mokdong Hospital from 1998 to 2018. Literature reviews were conducted via comparison with the results of 2015-2016 NACDG, 2013-2014 ESSCA, and standard antigens in K-camp. Results: The positive rates for KSS allergens from patients in 2018 were compared to those from 1998 to 2007. The top 3 allergens in two study periods are all metal allergens. The positive rates for balsam of Peru and paraben mix increased from 7.1% to 17.46% and from 2.73% to 7.94%, respectively. As compared with the results of NACDG standard series and EBS, KSS lacked fragrance and cosmetic series of allergens, especially fragrance mix II, methyldibromo glutaronitrile, and methylisothiazolinone. Conclusion: Our results, especially increasing trends of balsam of Peru and paraben mix, would be proven by multicenter study. Also, in the sight of increase of fragrance and preservative allergens, KSS could need the addition of the related allergens.
A Best Lag Size of Minimum Variance FIR Smoothers
Bo Kyu Kwon,Ji-Woong Choi,Jung Hun Park,Soohee Han,Wook Hyun Kwon IEEE 2009 IEEE signal processing letters Vol.16 No.4
<P>In this paper, we argue that the lag size of half a moving horizon of the minimum variance finite impulse response (MVFIR) smoother is not generally best in the sense of the estimation error variance even though it has been believed to be optimal for a simple input/output (I/O) model with correlated data. For a more general analysis, a state space model is considered in this paper. It is shown via numerical example that the dependency of the lag size on the minimum estimation error variance is asymmetric around half a moving horizon and varies with model parameters. In the case of a scalar system, the best lag size is represented in a closed-form. Some hints on a numerical method are presented for a more general vector system. Considering the lag size as well as the estimation error, we also propose a new performance criterion that puts a penalty on the large lag size while making the estimation error small.</P>