Jun Hyuk Son

Background: This study aimed to compare the surgical outcomes of pediatric patients with intermittent exotropia who underwent simultaneous eyelid and exotropia surgery and those who underwent exotropia surgery alone.Methods: The medical records of patients aged 0.05).Conclusion: Simultaneous eyelid and exotropia surgery produced surgical outcomes comparable to those of exotropia surgery alone, validating the safety and feasibility of the combined procedure in appropriately selected pediatric patients.

Purpose: We evaluated risk factors associated with reoperation following exposed hydroxyapatite orbital implant placement.Methods: We retrospectively analyzed 34 patients (34 eyes) diagnosed with exposed hydroxyapatite orbital implants at our institution between 2008 and 2022; all patients had a minimum follow-up of 12 months. All patients initially received conservative management. However, if symptoms, such as pain, discharge, or progressive exposure persisted, surgery was undertaken. We analyzed several variables, including age, sex, diabetic status, preoperative diagnosis, surgical approach, implant type and size, and exposed implant surface area. Regression analysis was performed to identify variables associated with reoperation.Results: Of the 34 patients (34 eyes), 17 (50.0%) were managed conservatively, whereas 17 (50.0%) required surgical intervention. Regression analysis revealed a significant association between the size of the exposed area and the need for reoperation (p = 0.018); however, other factors did not significantly impact reoperation rates. Receiver operating characteristic curve analysis identified a threshold of 4.5 mm for exposed area size, with an area under the curve of 0.934, sensitivity of 0.882, and specificity of 0.824. Patients categorized into small and large groups based on the 4.5 mm threshold revealed a statistically significant difference in reoperation rates (p < 0.001).Conclusions: Our study demonstrates that the size of the exposed area is the single most significant predictor of revision surgery in patients with exposed hydroxyapatite orbital implants. Notably, an exposed area > 4.5 mm was associated with a significantly increased risk of reoperation.

External beam radiotherapy is effective for stage I orbital mucosa-associated lymphoid tissue lymphoma (MALToma). Hence, very-low-dose radiotherapy is increasingly being investigated. We conducted a single-center prospective phase II trial to evaluate the effectiveness of very-low-dose radiotherapy of 4 Gy (2 Gy × 2 fractions) in pathologically confirmed stage I orbital MALToma. In this first prospective trial, patients with complete response were observed after 3–6 months of follow-up. For patients without complete remission, a radiation dose of 24 Gy/12 fractions was additionally delivered. The primary endpoint was complete response rate; secondary endpoints were overall survival, local control, and progression-free survival. Seventeen patients were screened and three patients refused enrollment during October 2018–October 2021. Thus, 14 patients (17 eyes) were analyzed (median follow-up, 28.2 months). The overall response rate was 100% (complete remission: 11 lesions; partial remission: six lesions). In all lesions with residual disease, additional radiation therapy (dose: 24 Gy) was performed. One local failure was observed. Therefore, 4 Gy ultralow-dose radiation therapy for orbital MALToma was safely performed with a planned second-line treatment in patients without complete remission. This is the first prospective study to report the effectiveness of ultralow-dose radiotherapy of 4 Gy for stage I orbital MALToma treatment.

Lymphoma is the most common primary tumor of the orbit, accounting for 55% of all orbital malignancies. When divided into histopathological subtypes, extranodal marginal zone lymphoma of mucosa-associated lymphoid tissue (MALT lymphoma) comprises the largest proportion. Clinical manifestations are unspecific, but in patients with slow-growing painless orbital mass, or red conjunctival lesion suggestive of ‘salmon patch’, ocular adnexa lymphoma (OAL) should be suspected. Although the pathogenetic mechanism of ocular adnexal MALT lymphoma (OAML) is not yet fully understood, the relationship between OAML and Chlamydia psittaci has been hypothesized recently, similar to that between gastric MALT lymphoma and Helicobacter pylori. This suggests a new treatment option for OAML; bacterial eradication therapy with systemic antibiotics. Several other treatment methods for OAML have been introduced, but no treatment guidelines have been established yet. In this article, we summarize the current knowledge on the clinical features, pathogenesis, diagnostic methods, therapeutic strategies, and prognosis of OAML.

Endoscopic ultrasonography-guided intervention has gradually become a standard treatment for peripancreatic fluid collections (PFCs). However, it is difficult to popularize the procedure in Korea because of restrictions on insurance claims regarding the use of endoscopic accessories, as well as the lack of standardized Korean clinical practice guidelines. The Korean Society of Gastrointestinal Endoscopy (KSGE) appointed a Task Force to develope medical guidelines by referring to the manual for clinical practice guidelines development prepared by the National Evidence-Based Healthcare Collaborating Agency. Previous studies on PFCs were searched, and certain studies were selected with the help of experts. Then, a set of key questions was selected, and treatment guidelines were systematically reviewed. Answers to these questions and recommendations were selected via peer review. This guideline discusses endoscopic management of PFCs and makes recommendations on Indications for the procedure, pre-procedural preparations, optimal approach for drainage, procedural considerations (e.g., types of stent, advantages and disadvantages of plastic and metal stents, and accessories), adverse events of endoscopic intervention, and procedural quality issues. This guideline was reviewed by external experts and suggests best practices recommended based on the evidence available at the time of preparation. This will be revised as necessary to address advances and changes in technology and evidence obtained in clinical practice and future studies.

Moon Jae Chung, Se Woo Park, Seong-Hun Kim, Chang Min Cho, Jun-Ho Choi, Eun Kwang Choi, Tae Hoon Lee, Eunae Cho, Jun Kyu Lee, Tae Jun Song, Jae Min Lee, Jun Hyuk Son, Jin Suk Park, Chi Hyuk Oh, Dong-Ah Park, Jeong-Sik Byeon, Soo Teik Lee, Ho Gak Kim, Hoon Jai Chun, Ho Soon Choi, Chan Guk Park, and Joo Young Cho. Gut and Liver 2021;15:354-74. https://doi.org/10.5009/gnl20302

Background: Retrobulbar hemorrhage (RBH) is a rare complication after orbital surgery but associated with ocular complications including blindness. The aim of this study was to identify clinical characteristics of patients with RBH requiring emergent orbital decompression after blowout fracture repair. Method: A retrospective review of 426 blowout fracture patients at a tertiary oculoplastic clinic provided data regarding demographics, physical examination findings, and computed tomography (CT) images. Extraocular motility had been recorded in patient charts on a scale from 0 to − 4. Patients requiring emergent orbital decompression due to RBH after surgery (RBH group) were compared with those who did not (Control group), using the Mann-Whitney U-test. Incidences of RBH according to primary or secondary surgery were also investigated, using Fisher’s exact test. Result: Five (1.2%) of the 426 patients who underwent blowout fracture repair developed RBH requiring emergent intervention. All RBH patients fully recovered after the decompression procedure or conservative treatment. Number of days to surgery was significantly longer in the RBH group (97.0 ± 80.1) than in the Control group (29.0 ± 253.0) (p = 0.05). Preoperative enophthalmos was also significantly greater in the RBH group (RBH vs. Control group, 3.6 ± 1.7 mm versus 1.2 ± 1.3 mm (p = 0.003)). The incidence of RBH was significantly higher in patients that underwent secondary surgery (odds ratio = 92.9 [95% confidence interval, 11.16–773.23], p = 0.001). Conclusions: Surgeons should pay more attention to hemostasis and postoperative care in patients with a large preoperative enophthalmic eye, when time from injury to surgery is long and in revision cases. When RBH occurs, time to intervention and surgical decompression is critical for visual recovery and preventing blindness. Trial registration: The institutional review board of the Yeungnam University Medical Center approved this study (YUMC 2018-11-010), which was conducted in accord with the Declaration of Helsinki.

Background: Retrobulbar hemorrhage (RBH) is a rare complication after orbital surgery but associated with ocular complications including blindness. The aim of this study was to identify clinical characteristics of patients with RBH requiring emergent orbital decompression after blowout fracture repair.Method: A retrospective review of 426 blowout fracture patients at a tertiary oculoplastic clinic provided data regarding demographics, physical examination findings, and computed tomography (CT) images. Extraocular motility had been recorded in patient charts on a scale from 0 to -4. Patients requiring emergent orbital decompression due to RBH after surgery (RBH group) were compared with those who did not (Control group), using the Mann-Whitney U-test. Incidences of RBH according to primary or secondary surgery were also investigated, using Fisher’s exact test.Result: Six (1.4%) of the 426 patients who underwent blowout fracture repair developed RBH requiring emergent decompression. All RBH patients fully recovered after the decompression procedure. Number of days to surgery was significantly longer in the RBH group (97.0 ± 80.1) than in the Control group (29.0 ± 253.0) (p = 0.05). Preoperative enophthalmos was also significantly greater in the RBH group (RBH vs. Control group, 3.6±1.7 mm versus 1.2 ± 1.3 mm (p = 0.003)). The incidence of RBH was significantly higher in patients that underwent secondary surgery (odds ratio = 92.9 [95% confidence interval, 11.16 – 773.23], p = 0.001).Conclusions: Surgeons should pay more attention to hemostasis and postoperative care in patients with a large preoperative enophthalmic eye, when time from injury to surgery is long and in revision cases. When RBH occurs, time to intervention and surgical decompression is critical for visual recovery and preventing blindness. Trial registration: The institutional review board of the Yeungnam University Medical Center approved this study (YUMC 2018-11-010), which was conducted in accord with the Declaration of Helsinki.