Ho Kyung Choung

Seoul National University Bundang Hospital, Seoul, Seoul, South Korea

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Publications (44)93.79 Total impact

  • Article: Expression of Shh and Wnt signaling pathway proteins in eyelid sebaceous gland carcinoma: clinicopathologic study.
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    ABSTRACT: PURPOSE: Activation or dysregulation of the Sonic hedgehog (Shh) and Wnt signaling pathways is suggested to lead to the development of many human malignancies. In this study, we investigated Shh and Wnt signaling protein expression in eyelid sebaceous gland carcinoma, and analyzed their correlation with clinical characteristics of the tumor. METHODS: Patients who underwent surgical resection of eyelid sebaceous gland carcinoma from 1999 to 2011 were recruited for the study. Immunohistochemical stainings of Shh signaling proteins (Shh, Gli-1, Gli-2, Gli-3, and ABCG2) and Wnt signaling proteins (Wnt, glycogen synthase kinase 3β, β-catenin, lipoprotein receptor-related protein [LRP], and c-Myc) were conducted. RESULTS: Thirty-seven cases of eyelid sebaceous gland carcinoma were included in this study. Twenty-nine patients showed no metastasis, and 8 patients showed lymph node or distant metastasis. Shh, ABCG2, and Wnt proteins were more highly expressed in the group with metastasis than in the group without metastasis (p = 0.031, p = 0.015, and p = 0.001, respectively, Chi-square test). Patients showing high ABCG2 expression, Wnt, or LRP expression developed metastasis more commonly than those with low ABCG2, or without Wnt or LRP expression (log-rank test, p = 0.019, 0.001, and 0.000, respectively). Conclusions: The group with metastasis showed higher expression levels of Shh, ABCG2, and Wnt than did the group without metastasis, and patients with strong ABCG2 expression, Wnt, or LRP expression showed higher cumulative incidence of LN or distant metastasis, implying that activation of the Shh and Wnt signaling pathway is associated with aggressive behavior of the tumor.
    Investigative ophthalmology & visual science 12/2012; · 3.43 Impact Factor
  • Article: Outcomes of various surgical procedures on acquired lower eyelid epiblepharon in thyroid associated ophthalmopathy.
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    ABSTRACT: To report the outcomes of acquired lower eyelid epiblepharon after various surgeries in thyroid associated ophthalmopathy (TAO) patients. A retrospective review of the medical records of 53 TAO patients with acquired lower eyelid epiblepharon between October 1999 and June 2011 was performed. Data were collected on demographics, type of lower eyelid epiblepharon, the detailed surgical history such as orbital decompression, retraction repair, or epiblepharon repair and surgical outcomes including follow-up period, recurrence of epiblepharon, and post-operative complications. Among the 53 TAO patients with acquired lower eyelid epiblepharon, 25 eyes of 17 patients underwent surgical management; 6 eyes of orbital decompression, 1 eye of orbital decompression followed by retraction repair, 2 eyes of orbital decompression followed by epiblepharon repair, 6 eyes of lower eyelid retraction repair, and 10 eyes of epiblepharon repair. Twenty two lower eyelid epiblepharons (88%) were resolved after final surgical treatment without complication during mean 16.2 months (SD, ±29.9 months) of follow up period; three of 6 epiblepharons that remained after orbital decompression underwent subsequent surgical management of retraction repair or epiblepharon repair, and epiblepharons were well-corrected. Mean amount of lower eyelid retraction was decreased from 1.68 mm (SD, ±1.17 mm) to 0.29 mm (SD, ±0.44 mm) after surgery, regardless of the type of surgery (n = 25, p < 0.000, Wilcoxon signed rank test). Acquired lower eyelid epiblepharon of TAO should be managed sequentially according to the general serial order of surgical managements in TAO; orbital decompression, correction of lower eyelid retraction and epiblepharon repair. Acquired lower eyelid epiblepharon was well resolved after surgical management in consecutive order, especially after repair of the lower eyelid retraction with a graft, or lower eyelid epiblepharon repair. Decreased lower eyelid retraction with a resolution of epiblepharon after surgery implied that lower eyelid retraction was associated with lower eyelid epiblepharon.
    Korean Journal of Ophthalmology 10/2012; 26(5):319-23.
  • Article: Congenital lacrimal fistula associated with Down syndrome.
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    ABSTRACT: The aim of this work is to investigate the prevalence and clinical characteristics of congenital lacrimal fistula in Down syndrome patients. The medical records of 198 Down syndrome patients who were referred to a tertiary ophthalmology clinic from 2000 to 2010 were retrospectively reviewed to identify patients with congenital lacrimal fistula. The demographic data, clinical features, clinical management, and clinical outcomes were recorded. The main outcome measures were the presence and laterality of fistula, accompanying adnexal and oculomotor abnormalities including congenital nasolacrimal duct obstruction (NLDO), the type of surgery performed, and surgical outcome. The prevalence of congenital lacrimal fistula in Down syndrome patients was calculated upon this data. Congenital lacrimal fistula was identified in 8/198 (4.04 %) patients, 4 (2.02 %) of whom presented with bilateral lacrimal fistula. All patients that had lacrimal fistula complained of tearing from their eyes. Congenital NLDO was observed in seven of eight patients with lacrimal fistula. Five patients underwent excision of the lacrimal fistula for the improvement of cosmesis, and three of these patients also underwent lacrimal silicone intubation for NLDO. Another patient received lacrimal silicone intubation for NLDO without excision of the lacrimal fistula. Excision of the lacrimal fistula was successful in all patients; however, tearing persisted after surgery in two patients with uncorrected NLDO. Congenital lacrimal fistula occurs more frequently in Down syndrome patients and therefore these patients should be thoroughly examined for this abnormality. Down syndrome patients with congenital lacrimal fistula should be also examined for NLDO, because this condition is frequently observed in these patients.
    Albrecht von Graæes Archiv für Ophthalmologie 06/2012; 250(10):1515-9. · 2.17 Impact Factor
  • Article: Multigene methylation analysis of ocular adnexal MALT lymphoma and their relationship to Chlamydophila psittaci infection and clinical characteristics in South Korea.
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    ABSTRACT: We investigated the aberrant promoter methylation status of known or suspected tumor suppressor genes in ocular adnexal lymphoma (OAL) and the possible association with clinical characteristics and Chlamydophila psittaci infection. Thirty-five cases of ocular adnexal mucosa-associated lymphoid tissue (MALT) lymphoma cases were examined for the methylation status of nine genes using methylation-specific PCR and for the detection of C. psittaci DNA using PCR. The medical records were reviewed retrospectively. Patient demographics, clinical characteristics including the response of the lymphoma to the therapy, and C. psittaci infection status were evaluated for possible association with methylation frequencies. CpG island methylation in nine genes was variously found as follows; DAPK (94.3%), ECAD (77.1%), MT1G (48.6%), THBS1 (37.1%), RAR-β (31.4%), p16 (20%), MGMT (5.7%), p14 (0%), and RASSF1A (0%). Methylation was not observed in any of 13 control cases. C. psittaci DNA was observed in 25 (75.8%) of 33 patients with available tumor tissues, and ECAD hypermethylation was significantly higher in C. psittaci-positive cases (P = 0.041). Promoter hypermethylation status was not correlated with clinical characteristics. Aberrant CpG island methylation of tumor suppressor genes is a frequent event in ocular adnexal MALT lymphoma. In particular, high frequencies of DAPK and ECAD methylation may be strongly correlated with ocular adnexal MALT lymphomagenesis in South Korea. Furthermore, ECAD hypermethylation is closely associated with C. psittaci infection, which may shed light on the mechanisms of bacterium-induced oncogenesis.
    Investigative ophthalmology & visual science 03/2012; 53(4):1928-35. · 3.43 Impact Factor
  • Article: Delayed superior forniceal CSF accumulation and conjunctival prolapse after superior orbital wall fracture.
    Jinho Lee, Namju Kim, Ho-Kyung Choung, Sang In Khwarg
    Albrecht von Graæes Archiv für Ophthalmologie 02/2012; · 2.17 Impact Factor
  • Article: Acquired lower eyelid epiblepharon in thyroid-associated ophthalmopathy of Koreans.
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    ABSTRACT: To investigate the prevalence and clinical features of acquired lower eyelid epiblepharon in Korean patients with thyroid-associated ophthalmopathy (TAO) and compare the pathogenic features of acquired and congenital epiblepharon. Retrospective, nonrandomized, comparative case series, cross-sectional study. A total of 494 Korean patients with TAO and 845 Korean patients with congenital lower eyelid epiblepharon. The medical records were reviewed, and the presence, location, and extent of epiblepharon were identified. Clinical features of TAO (lower eyelid retraction, exophthalmos, and elevation limitation) were compared between patients with TAO with and without epiblepharon. Acquired epiblepharon was classified into 3 types according to the location and extent. The prevalence of epiblepharon types was determined and evaluated for associations with TAO clinical features. Comparisons were made between the prevalence of epiblepharon types in acquired and congenital epiblepharon. Prevalence, location, and extent of epiblepharon; association with clinical features of TAO; and difference from congenital epiblepharon. An acquired lower eyelid epiblepharon was found in 42 (8.5%) of 494 patients with TAO. The mean age of patients with TAO with epiblepharon (34.2±13.5 years) was significantly lower than that of patients with TAO without epiblepharon (46.5±14.1 years) (P = 0.000). Lower eyelid retraction (0.78±1.11 mm) was more severe in patients with TAO with epiblepharon than in patients without epiblepharon (0.30±0.73 mm) (P = 0.000). Lower eyelid retraction was more severe in diffuse-type acquired epiblepharon than in central-type epiblepharon (P = 0.012). Elevation limitation was more severe in central-type acquired epiblepharon than in medial-type epiblepharon (P = 0.001). The occurrence of central-type epiblepharon was higher in TAO-associated acquired epiblepharon (20 eyelids, 30.8%) than in congenital epiblepharon (27 eyelids, 1.9%, P = 0.000). Acquired lower eyelid epiblepharon is one of the clinical features of patients with TAO. The association between lower eyelid retraction and acquired epiblepharon may lead to a better understanding of the cause of acquired epiblepharon in patients with TAO.
    Ophthalmology 02/2012; 119(2):390-5. · 5.45 Impact Factor
  • Article: Dermis-fat graft for treatment of exposed porous polyethylene implants in pediatric postenucleation retinoblastoma patients.
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    ABSTRACT: To demonstrate the use of the autogenous dermis-fat graft for the treatment of porous polyethylene implant exposure and volume augmentation in postenucleation retinoblastoma children. Retrospective, interventional case series. Ten children who received a dermis-fat graft at Seoul National University Hospital between July 1, 2005 and January 31, 2010 were included in this study. The patients had undergone unilateral enucleation for retinoblastoma, and received a subconjunctival dermis-fat graft to repair implant exposure and simultaneously correct enophthalmos. The clinical characteristics of the patients, rate of graft survival, and complications were analyzed. The cosmetic outcome was assessed using a grading system. All patients had enucleation using porous polyethylene implant as a primary orbital implant. The average time to exposure was 89.1 ± 22.4 months and the median size of defect was 2 × 3 mm. With a mean follow-up of 28 months, 9 of 10 patients showed well-survived graft without re-exposure. One patient who experienced a graft failure managed with implant rotation and a scleral graft. Seven patients showed significant improvement of enophthalmos. Implantation of an autogenous dermis-fat graft is a procedure that can be effectively used to treat porous polyethylene implant exposure and simultaneously correct enophthalmos. Use of this procedure can be particularly advantageous for pediatric postenucleation patients.
    American journal of ophthalmology 06/2011; 152(2):244-250.e2. · 3.83 Impact Factor
  • Article: Reply.
    American journal of ophthalmology 06/2011; 151(6):1104-5. · 3.83 Impact Factor
  • Article: Evaluation of lacrimal tear drainage mechanism using dynamic fluoroscopic dacryocystography.
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    ABSTRACT: To evaluate the dynamic change of the canaliculus and the lacrimal sac during blinking using fluoroscopic dacryocystography. Sixteen patients presenting with unilateral epiphora were enrolled in the study. Fluoroscopic dacryocystography was performed in both eyes, and sequential images of the lacrimal drainage system were acquired during blinking. On examination of the contralateral asymptomatic side, the length of the lower canaliculus and the width of the superior and inferior portions of the lacrimal sac were measured and compared between eyelid closure and opening. The length of the lower canaliculus decreased with eyelid closure in 13 of 16 patients, and the change was statistically significant (p = 0.006, Wilcoxon signed rank test). The width of the superior portion of the lacrimal sac increased with eyelid closure (p = 0.033), but the width of the inferior part did not change significantly (p = 0.679). With eyelid closure, the canalicular system contracts, and the superior portion of the lacrimal sac dilates; these may be important parts of the active lacrimal pump mechanism. These findings suggested that the canalicular system and the superior portion of the lacrimal sac play key roles in active tear drainage pump.
    Ophthalmic plastic and reconstructive surgery 10/2010; 27(3):164-7. · 0.69 Impact Factor
  • Article: Prognosis of upper eyelid epiblepharon repair in down syndrome.
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    ABSTRACT: To evaluate the recurrence rate after upper eyelid epiblepharon repair in patients with Down syndrome. Retrospective, observational study. Total of 578 Korean children (21 with Down syndrome patients, 557 with non-Down syndrome patients), who had undergone epiblepharon repair and were followed up for more than 2 months, were included in this study. The recurrence rate was compared between two groups at 2, 6 months after surgery. Recurrence was defined as the re-appearance of cilia touching to cornea. The recurrence rate was also analyzed according to whether patients had undergone concomitant z-medial epicanthoplasty or not. Lower eyelid epiblepharon repair was performed on 22 eyelids of Down syndrome patients, and 1072 eyelids of non-Down syndrome patients. At 3 months after surgery, the recurrence rate was not significantly different between two groups (P = 1.00). Upper eyelid epiblepharon was repaired on 40 eyelids of Down syndrome patients, and 204 eyelids in non-Down syndrome patients. At 2 and 6 months after surgery, the recurrence rate was significantly higher in Down syndrome patients (27.5% and 29.4%) than non-Down syndrome patients (3.4% and 4.6%) (P = 0.000, P = 0.004, respectively). The recurrence rate of upper eyelid epiblepharon repair was not affected in both groups whether Z-epicanthoplasty was combined or not (P = 1.00 in both groups). In Down syndrome patients, the recurrence rate after upper eyelid epiblepharon repair was higher than non-Down syndrome patients. The effect of combined Z-medial epicanthoplasty was limited in both groups.
    American journal of ophthalmology 10/2010; 150(4):476-480.e1. · 3.83 Impact Factor
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    Article: Eye-preserving therapy in retinoblastoma: prolonged primary chemotherapy alone or combined with local therapy.
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    ABSTRACT: To evaluate the efficacy of primary chemotherapy combined with local therapy in the treatment of retinoblastomas not treatable with a single therapeutic method. We performed a retrospective chart review of 227 patients diagnosed with retinoblastoma. Sixty-five eyes in 52 patients had tumors not treatable with a single therapeutic method and received primary chemotherapy combined with local therapy as needed. Tumor control and eye salvage was achieved in 34 of the 65 eyes; the probability of ocular survival was 46.56% using the Kaplan-Meier method. Forty-three of the 65 eyes were group D or E tumors, in which tumor control and eye salvage was achieved in 16 eyes. Twenty eyes were treated with chemotherapy only, while 28 eyes received one additional modality of local therapy, and 17 eyes received two modalities of local therapy. Of the eyes treated with chemotherapy only, tumor control was achieved in 5 eyes. Primary chemotherapy combined with local therapy can be effective and safe in the treatment of retinoblastomas otherwise untreatable with other therapeutic methods, such as group D and E retinoblastomas. More vigorous treatment with more local therapeutic methods combined may yield even better results.
    Korean Journal of Ophthalmology 08/2010; 24(4):219-24.
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    Article: Lower eyelid epiblepharon associated with lower eyelid retraction.
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    ABSTRACT: To describe a series of patients with lower eyelid epiblepharon associated with lower eyelid retraction. We retrospectively reviewed the medical records of patients who underwent surgery for lower eyelid retraction, epiblepharon, or thyroid-associated ophthalmopathy (TAO) between October 1999 and March 2007. Patients with both lower eyelid retraction and epiblepharon on preoperative examination were included in this study. Twenty-seven eyelids of 20 patients with both lower eyelid retraction and epiblepharon were enrolled. The underlying causes of lower eyelid retraction included congenital retraction (seven eyelids), congenital fibrosis of the extraocular muscles (CFEOM; seven eyelids), TAO (seven eyelids), post-operative cicatricial retraction (five eyelids), and facial nerve palsy (one eyelid). Eight of 27 eyelids were successfully corrected after the repair of retraction without the repair of epiblepharon, regardless of the cause of lower eyelid retraction. Another four eyelids with epiblepharon associated with TAO resolved after only orbital decompression. Cilia-everting sutures were additionally applied for epiblepharon in another 14 eyelids, 12 of which did not require the excision of a skin fold or the orbicularis muscles. Only one eyelid with mild retraction and epiblepharon underwent simple epiblepharon repair. Recurrence of retraction or epiblepharon developed in three eyelids during follow-up. In cases with both lower eyelid retraction and epiblepharon, the retraction should be repaired first, and then the epiblepharon can be corrected selectively according to the severity of the case.
    Korean Journal of Ophthalmology 02/2010; 24(1):4-9.
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    Article: Management of dermoid tumor in the medial canthal area.
    Nam Ju Kim, Ho Kyung Choung, Sang In Khwarg
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    ABSTRACT: Dermoid tumors in the medial canthal area are rare, but when present they commonly adhere to the lacrimal canaliculi. Three patients presented with a mass in the medial canthal area. The authors performed excisional biopsies, and the masses were diagnosed as dermoid tumors. In two patients, canalicular lacerations were found after mass excision, which suggested that the masses had been firmly adherent to the lacrimal canaliculi. The lacerated canaliculi were repaired after bicanalicular silicone intubation. In the remaining patient, lacrimal silicone intubation was performed at the beginning of surgery, and the mass was successfully dissected from the canaliculi, leaving them intact. Excision of dermoid tumors in the medial canthal area requires careful dissection to avoid canalicular laceration. Bicanalicular silicone intubation at the beginning of surgery is helpful for the identification of the canaliculi and for the prevention of canalicular laceration during dermoid tumor excision.
    Korean Journal of Ophthalmology 09/2009; 23(3):204-6.
  • Article: Effect of slow-releasing all-trans-retinoic acid in bioabsorbable polymer on delayed adjustable strabismus surgery in a rabbit model.
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    ABSTRACT: To determine the usefulness of slow-releasing all-trans-retinoic acid (ATRA) in polytetrafluoroethylene (PTFE)/polylactide-co-glycolide (PLGA) for delayed adjustable strabismus surgery. Animal study. A prospective, masked-observer, controlled study was performed in 25 rabbits. Fifty rabbit eyes were divided randomly into three groups. After a recession of the superior rectus muscle, a PTFE/PLGA laminate containing ATRA, PTFE alone, or balanced salt solution was applied beneath and over the superior rectus muscle in the PTFE/PLGA/all-trans-retinoic acid group (ATRA group), the polytetrafluoroethylene group (PTFE group), and the control group, respectively. Delayed adjustment was performed once on each superior rectus muscle at 3 or 5 weeks after surgery by a masked observer. In the control group, adjustment was possible in 2 of 5 eyes at 3 weeks after surgery and impossible in any eye at 5 weeks after surgery. In the PTFE and ATRA groups, adjustment was possible in all 10 eyes at 3 and 5 weeks after surgery. On comparing adjustability, a significant difference was observed between the PTFE group and the control group or between the ATRA group and the control group 5 weeks after surgery (P = .0003 and P = .0003, respectively). A significant difference was observed between the ATRA group and the control group in terms of adhesion between superior rectus muscles and sclerae at 5 weeks after surgery (P = .006). Slow-releasing ATRA in PTFE/PLGA was found to reduce adhesion and to allow delayed adjustment in most eyes for up to 5 weeks after surgery.
    American journal of ophthalmology 08/2009; 148(4):566-72. · 3.83 Impact Factor
  • Article: One-snip punctoplasty and canalicular curettage through the punctum: a minimally invasive surgical procedure for primary canaliculitis.
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    ABSTRACT: To evaluate treatment results of canalicular curettage through the punctum after 1-snip punctoplasty for primary canaliculitis. Retrospective, interventional case series. Thirty patients with primary canaliculitis who were treated at Seoul National University Hospital between February 2005 and January 2008. All patients underwent 1-snip punctoplasty and canalicular curettage through the punctum, and granules or concretions were removed. After the procedure, oral and topical antibiotics were used for 3 weeks. Demographic data and clinical presentations of the patients were analyzed. The resolution of symptoms and inflammatory signs and complications were evaluated 3 weeks after the procedure. Resolution rate of the canaliculitis and complications after the procedure. There was a female predominance in the study group (23:7). Common symptoms of canaliculitis included discharge, tearing, and pus or concretions from the punctum. During the procedure, concretions, granules, or discharges were drained in all patients. In 25 (83.3%) of 30 patients, the symptoms and signs of canaliculitis completely resolved 3 weeks after 1 treatment. Two patients (6.7%) required additional curettage. Symptomatic canalicular strictures developed in 2 patients. Materials were removed easily from the canaliculus using a 1-snip punctoplasty and curettage through the punctum. This procedure, combined with systemic and topical antibiotic therapy, can be a highly effective treatment for primary canaliculitis.
    Ophthalmology 08/2009; 116(10):2027-30.e2. · 5.45 Impact Factor
  • Article: Ophthalmoplegia diagnosis.
    Ophthalmology 05/2009; 116(4):813-4, 814.e1-2. · 5.45 Impact Factor
  • Article: Incidence and clinical features of ethambutol-induced optic neuropathy in Korea.
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    ABSTRACT: The incidence, clinical manifestations, and contributory factors in ethambutol-induced optic neuropathy (EON) have not been widely studied. A retrospective chart review of 857 patients who took ethambutol for treatment of tuberculosis identified 89 patients who complained of decreased vision after initiation of treatment and were therefore referred to the ophthalmology clinic of Seoul National University Hospital, Korea, between January 2003 and December 2005. Information was extracted in regard to systemic illnesses, duration and dose of ethambutol therapy, visual acuity, color vision, ophthalmoscopic examination, visual fields, and visual evoked potentials (VEPs). EON was diagnosed in 13 (1.5%) patients during a follow-up period of 12.54 +/- 9.97 months. The average dose of ethambutol was 17.85 +/- 2.21 mg/kg/day, and the duration of therapy was 9.38 +/- 10.12 months. Ophthalmic findings included decreased visual acuity (65.4%), abnormal visual fields (65.4%), abnormal color vision (61.5%), optic disc pallor (38.5%), or increased latency on VEP tests (65.4%). Slightly less than one third of patients showed improvement in visual function after discontinuing ethambutol. The latency for recovery was 5.38 +/- 1.71 months. No patient with optic disc pallor at the time of diagnosis of EON showed visual function improvement. Renal dysfunction and the daily dose of ethambutol, but not the duration of treatment, contributed to EON. Based on this study, the incidence of EON in Koreans is estimated to be <2%. However, visual function after discontinuation of ethambutol is reversible in only a minority of patients and does not occur if optic disc pallor is present. Renal dysfunction and daily dose of ethambutol, but not duration of ethambutol treatment, seem to be related to development of EON.
    Journal of neuro-ophthalmology: the official journal of the North American Neuro-Ophthalmology Society 12/2008; 28(4):269-77. · 1.09 Impact Factor
  • Article: Frontalis sling operation using silicone rod compared with preserved fascia lata for congenital ptosis a three-year follow-up study.
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    ABSTRACT: To evaluate the 3-year results of frontalis sling operation using a silicone rod compared with preserved fascia lata for congenital ptosis. Retrospective, nonrandomized, comparative, interventional case series. One hundred twenty-three patients with congenital ptosis. The medical records of 123 patients who underwent a frontalis sling operation for congenital ptosis were retrospectively reviewed. Patients were divided into 2 groups according to the sling material used; a preserved fascia lata group (n = 63) and a silicone rod group (n = 60). Cosmetic results and recurrence rates were compared between these 2 groups. The cosmetic results of the frontalis sling operation were assessed as good, fair, or poor based on the habitual upper lid heights and symmetry, and bilateral cases and unilateral cases were compared separately. Recurrence was defined as the conversion of the cosmetic result from good or fair to poor category. Postoperative cosmetic results and recurrence rate. At the 3- and 6-month follow-ups, the cosmetic results were not significantly different between the 2 groups (P = 0.17 and P = 0.25 for bilateral cases and P = 0.14 and P = 0.35 for unilateral cases, respectively, by Armitage's test of trend in proportions). However, the silicone rod group showed significantly better cosmetic results than the preserved fascia lata group at 1, 2, and 3 years after surgery in both bilateral and unilateral cases (all P < 0.05, by Armitage's test of trend in proportions). At 3 years after surgery, the recurrence rates were 29.2% (7/24 bilateral cases) and 11.1% (3/27 unilateral cases) for the silicone rod group, and 63.2% (12/19 bilateral cases) and 41.4% (12/29 unilateral cases) for the preserved fascia lata group. Given the limitations of this retrospective study, the frontalis sling operation using a silicone rod showed better cosmetic results and lower recurrence rate compared to the procedure using preserved fascia lata up to 3 years after surgery for congenital ptosis. However, only prospective randomized studies can give a more accurate conclusion in that regard. The authors have no proprietary or commercial interest in any of the materials discussed in this article.
    Ophthalmology 11/2008; 116(1):123-9. · 5.45 Impact Factor
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    Article: Frontalis sling operation using silicone rod for the correction of ptosis in chronic progressive external ophthalmoplegia.
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    ABSTRACT: The aim of the study was to evaluate the results of the frontalis sling operation using silicone rod for the correction of ptosis in chronic progressive external ophthalmoplegia patients. Chronic progressive external ophthalmoplegia patients who received the frontalis sling operation using silicone rods from 1999 to 2006 were included in this study. The medical records were retrospectively reviewed and the clinical characteristics and postoperative surgical results of these patients were analysed. This study was a retrospective, non-randomised, interventional case series and the main outcome measures were margin reflex distance, eyelid contour and corneal status. Seven patients were recruited (one male and six female). The mean age at the time of operation was 29.6 (range 15-62) years. Two patients had unilateral ptosis and five patients had bilateral ptosis. The mean follow-up period was 22.7 (range 1-61) months. Satisfactory lid height was achieved in all patients. Although corneal erosions were detected in five patients 1 month after surgery, these findings eventually resolved in three patients 2 months later, after the use of artificial tear eyedrops and ointments. The frontalis sling operation using silicone rod can safely and effectively correct ptosis in chronic progressive external ophthalmoplegia patients without serious corneal complications.
    The British journal of ophthalmology 10/2008; 92(12):1685-8. · 2.92 Impact Factor
  • Article: Obesity may not be a risk factor for idiopathic intracranial hypertension in Asians.
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    ABSTRACT: Idiopathic intracranial hypertension (IIH) is a clinical condition characterized by signs and symptoms of increased intracranial pressure. We demonstrated the clinical presentation of IIH of Asians and investigated any ethnic difference in pathogenesis. Ten patients who fulfilled the modified Dandy criteria and four with presumed diagnosis for IIH were included. Only one patient (7.1%) was obese according to body mass index, seven were overweight, and six weighed normal. Obesity was not frequently found in Caucasians with IIH. This data indirectly suggest that obesity may not play a major role in the pathogenesis of IIH in Asians. Awareness of this is helpful in early diagnosis and treatment of IIH in Asians.
    European Journal of Neurology 09/2008; 15(8):876-9. · 3.69 Impact Factor

Institutions

  • 2012
    • Seoul National University Bundang Hospital
      Seoul, Seoul, South Korea
  • 2006–2012
    • Seoul National University
      • • Department of Ophthalmology
      • • College of Pharmacy
      Seoul, Seoul, South Korea
  • 2005–2012
    • Seoul National University Hospital
      Seoul, Seoul, South Korea
  • 2011
    • Hallym University Medical Center
      Seoul, Seoul, South Korea
  • 2010
    • Inje University Paik Hospital
      Goyang, Gyeonggi, South Korea
  • 2008
    • Dongguk University
      • Department of Ophthalmology
      Seoul, Seoul, South Korea