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This work investigates the physicochemical characteristics of grease-trap wastewater discharged from a large community market. It proposes potential mechanisms of fat, oil, and grease (FOG) solid formation, separation, and accumulation inside grease traps. Sixty-four samples, i.e., the floated scum, suspended solid-liquid wastewater, and settled sludge, were collected from the grease-trap inlet and outlet chambers. A lower pH of 5-6 at 25-29 °C inside the grease trap than those reported under the sewer conditions (pH 6-7) was revealed. A significant difference in solid and dissolved constituents was also discovered between the inlet and outlet chambers, indicating that the baffle wall could affect the separation mechanism. The sludge samples had 1.5 times higher total solids (TS) than the scum samples, i.e., 0.225 vs. 0.149 g g -1 TS, revealing that the sludge amount impacted more significantly the grease trap capacity and operation and maintenance. In contrast, the scum samples had 1.4 times higher volatile solids (VS) than the sludge samples, i.e., 0.134 vs. 0.096 g g -1 VS, matching with the 64.2 vs. 29.7% of carbon content from CHN analysis. About 2/3 of the free fatty acids (FFAs) with palmitic acids were the primary saturated FFAs, while the remaining 1/3 of unsaturated FFAs were found in the solid and liquid samples. Although up to 0.511 g g -1 FOG can be extracted from the scum samples, none from the sludge samples. More diverse minerals/metals other than Na, Cl, and Ca were found in the sludge samples than in the scum samples. Grease-trap FOG solids and open drain samples exhibited similar physicochemical properties to those reported in the literature. Four potential mechanisms (crystallization, emulsification, saponification, and baffling) were presented. This work offers insights into the physicochemical properties of grease-trap wastewater that can help explore its FOG solid formation, separation, and accumulation mechanisms inside a grease trap., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Ngie Hing Wong reports financial support was provided by Malaysia Ministry of Higher Education. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024. Published by Elsevier Ltd.)

Introduction: This study aims to find out the optimal timing for herniotomy for premature infants with inguinal hernia (IH): early during hospitalisation or delayed after hospital discharge., Method: A retrospective cohort study was conducted on premature infants diagnosed with IH during their initial hospitalization between 2015 and 2020. Demographic data and clinical outcomes were compared between infants undergoing herniotomy before discharge ("early") and those who were discharged without herniotomy ("delayed"). Student's t-test or Mann-Whitney U test and Fisher's exact test were used for statistical analysis., Results: Of 219 premature infants, 189 (86.3%) underwent early herniotomy, while 30 were discharged with unoperated IH. In the delayed group, 15 (50%) underwent planned delayed herniotomy, and the remaining 15 experienced spontaneous resolution (absence of inguinal bulge over at least 1-year follow-up). The gestational age and birth weight of both groups were similar. At surgery, the delayed group median (interquartile range) was significantly older (42.1[38-49] vs 37.7 [36-40] weeks, p < 0.001) and heavier (3.27 [2.21-4.60] vs 2.22 [2.00-2.70] kg, p < 0.001). Two infants (1%) in the early group presented with incarcerated IH requiring urgent operation. In the delayed group, no infant developed incarcerated IH while awaiting elective operation (time from diagnosis to operation 44 [21-85] days). There was no statistically significant difference in respiratory and surgical complications between the two groups, although the delayed group had lesser surgical complications (0% vs 9.5%)., Conclusion: Deferring herniotomy after discharge for premature infants is safe with close monitoring and associated with a chance of spontaneous resolution., Level of Evidence: Level III, treatment study., Competing Interests: Conflict of interest The authors declare that there are no known conflicts of interest associated with this publication., (Copyright © 2023 Elsevier Inc. All rights reserved.)

Background: During the Coronavirus disease 2019 (COVID-19) pandemic, a protocol was adopted by our department on antibiotics treatment for Acute Uncomplicated Appendicitis (AUA). Our study aimed to determine the feasibility and safety of non-operative treatment (NOT), compared to upfront laparoscopic appendectomy (LA), for AUA in children during the pandemic., Method: Our prospective comparative study was conducted from May 1, 2020 to January 31, 2021. Patient selection criteria included: age ≥5 years, abdominal pain duration ≤48 h, ultrasound (US)/Computered Tomography scan confirmation of AUA, US appendiceal diameter 6-11 mm with no features of perforation/abscess collection and no faecolith. For NOT patients, intravenous antibiotics were administered for 24-48 h followed by oral for 10-day course. Comparison was performed between patients whose parents preferred NOT to those who opted for up-front appendectomy. Primary outcomes were NOT success at index admission, early and late NOT failure rates till 27 months. Secondary outcomes were differences in complication rate, hospital length of stay (LOS) and cost between groups., Results: 77 patients were recruited: 43 (55.8%) underwent NOT while 34 (44.2%) patients opted for LA. Success of NOT at index admission was 90.7% (39/43). Overall, NOT failure rate at 27 months' follow-up was 37.2% (16/43). Of the NOT failures, 1 appendix was normal on histology while only 1 was perforated. There were no significant differences in secondary outcomes between both groups except for LOS of late NOT failure. Cost for upfront LA was nearly thrice that of NOT., Conclusion: Our stringent COVID protocol together with shared decision-making with parents is a safe and feasible treatment option during a crisis situation., Level of Evidence: Treatment study, Level II., (Copyright © 2023 Elsevier Inc. All rights reserved.)

Objectives: To evaluate the clinical outcomes of herniotomy in preterm infants undergoing early versus delayed repair, the risk factors for complications, and to identify best timing of surgery., Methods: Medline, Embase and Central databases were searched from inception until 25 Jan 2021 to identify publications comparing the timing of neonatal inguinal hernia repair between early intervention (before discharge from first hospitalization) and delayed (after first hospitalisation discharge) intervention. Inclusion criteria was preterm infants diagnosed with inguinal hernia during neonatal intensive care unit admission. Results were analyzed using fixed and random effects meta-analysis (RevManv5.4)., Results: Out of 721 articles found, six studies were included in the meta-analysis. Patients in the early group had lower odds of developing incarceration [odds ratio (OR) 0.43, 95% confidence interval (CI) 0.34-0.55, I 2  = 0%, p < 0.001]; but higher risk of post-operative respiratory complications (OR 4.36, 95% CI 2.13-8.94, I 2  = 40%, p < 0.001). No significant differences were reported in recurrence rate (OR 3.10, 95% CI 0.90-10.64, I 2  = 0%, p = 0.07) and surgical complication rate (OR 0.94, 95% CI 0.18-4.83, I 2  = 0%, p = 0.94) between early and delayed groups., Conclusion: While early inguinal hernia repair in preterm infants reduces the risk of incarceration, it increases the risk of post-operative respiratory complications compared to delayed repair. Surgeons should discuss the risks and benefits of delaying inguinal hernia repair with the caregivers to make an informed decision best suited to the patient physiology and circumstances., Level of Evidence: Treatment study, level 3., Competing Interests: Declaration of Competing Interest The study has been submitted as a dissertation course work for a master degree to the University of Edinburgh. The authors declare that there is no conflict of interest to disclose., (Copyright © 2022 Elsevier Inc. All rights reserved.)

Introduction: Testicular pain is a common presentation amongst young boys. It is important to distinguish between testicular torsion and other testicular pathology as testicular viability is dependent on timely diagnosis and surgical intervention., Objectives: The aim of this study was to evaluate the utility of the TWIST score in our population. Our second objective was to compare a new testicular torsion score (TT score) developed in a paediatric Asian population, with the TWIST score in risk stratification for testicular torsion. Duration of symptoms and delays after presentation were also correlated with testicular viability., Methods: This is a prospective cohort study of children admitted with testicular pain from January 2016 to December 2018 at a tertiary care hospital in Singapore. Relevant findings such as age, nausea/vomiting, testicular swelling/firmness, absence of cremasteric reflex and abnormal lie were collected. Univariate and multivariate logistic regression was performed to identify significant predictive factors of testicular torsion to generate TT score., Results: A total of 315 patients were involved in this study. Mean age of patients was 121.3 ± 44.2 months. There were 43 patients with testicular torsion. No patients with a TT score of ≤1 were found to have testicular torsion. In contrast, 10 patients with a TWIST score of ≤2 were found to have testicular torsion. Of the patients with testicular torsion, 16 had a TWIST score of ≥5 and 22 had a TT score of ≥6. In this study, the area under the curve was 0.87 for the TWIST score and 0.93 for the TT score., Conclusion: In conclusion, the TT score is a reliable score for excluding testicular torsion in an Asian patient population with a sensitivity and negative predictive value of 100% at a cut-off value of ≤1. Both TWIST and TT score performed equally well in early presenters (<6 h) Further prospective validation studies are needed to evaluate the utility of the TT score. Delay in presentation to hospital is the most important determinant of outcome., Competing Interests: Conflicts of interest None., (Copyright © 2020 Journal of Pediatric Urology Company. Published by Elsevier Ltd. All rights reserved.)

Purpose: Our purpose was to evaluate the outcomes and profiles of older patients with muscle-invasive bladder cancer (MIBC) treated with definitive radiation therapy (RT) with or without chemotherapy (CHT) at a tertiary medical center., Methods and Materials: A retrospective study was conducted for older patients with MIBC who were ≥70 years old and underwent RT with or without CHT between 2000 and 2016. Overall survival (OS) was estimated using the Kaplan-Meier method. Disease-specific survival (DSS), cumulative incidence of progression, patterns of recurrence, and toxicities were examined. Univariate analyses were performed to identify variables associated with OS, DSS, and cumulative incidence of progression, using the Cox proportional hazards model., Results: A total of 84 patients underwent definitive RT with or without CHT. Of these, only 29% were deemed medically fit to undergo radical cystectomy, and the remainder were medically unfit or had surgically unresectable disease. Median age was 81 years. Sixty-one percent, 29%, and 11% had clinical stage II, III, and IV disease, respectively. Eighty-six percent had maximal transurethral resection of bladder tumor before RT. Seventy-three percent received CHT with RT, and 27% had RT alone. Median follow-up was 5.7 years. Median OS was 1.9 years. OS was 42% and 25%, and DSS was 64% and 54% at 3 and 5 years, respectively. On univariate analysis, medical fitness to undergo radical cystectomy, receipt of CHT, lower T stage, and maximal transurethral resection of bladder tumor were associated with better OS; lower T stage was associated with better DSS. The cumulative incidence of progression was 44% and 49% at 3 and 5 years, respectively. Late grade 3 genitourinary and gastrointestinal toxicity were 15% and 4%, respectively. None had grade 4 or 5 toxicity., Conclusions: Older patients with MIBC referred for RT were often medically unfit or had a surgically unresectable tumor. In these medically compromised patients, definitive RT with or without CHT was well tolerated and yielded encouraging treatment outcomes., (Copyright © 2020 American Society for Radiation Oncology. Published by Elsevier Inc. All rights reserved.)

Chondrosarcoma (CS) is a malignant tumour of long and flat bone characterised by the formation of cartilage. Mesenchymal chondrosarcoma (MCS) is a rare subtype of CS that is more aggressive and may lead to erroneous diagnosis in a limited biopsy. The diagnosis is mainly based on the histopathological appearance of biphasic pattern of undifferentiated small round cells separated by islands of well-differentiated hyaline cartilage. We report a case of 13-year-old boy who initially presented with gum swelling and the biopsy result suggested a benign fibrous lesion. Following an extensive lesion shown in radiologic findings, the tumour excision was done and finally was diagnosed as an MCS of the maxilla. The patient was given postoperative chemotherapy (EURO-EWING 99 regimen), and now on regular follow-up for monitoring of local recurrence or tumour metastasis., Competing Interests: Competing interests: None declared., (© BMJ Publishing Group Limited 2019. No commercial re-use. See rights and permissions. Published by BMJ.)

Purpose: The aim of our study was to develop an appendicitis score incorporating a urine biomarker, Leucine rich alpha-2-glycoprotein (LRG), for evaluation of children with abdominal pain., Methods: From January to August 2017 we prospectively enrolled children aged 4-16 years old admitted for suspected appendicitis. Urine samples for LRG analysis were obtained preoperatively and quantified by enzyme-linked immunosorbent assay (ELISA) after correction for patient hydration status. The diagnosis of appendicitis was based on operative findings and histology. Logistic regression was used to identify prospective predictors., Results: A total of 148 patients were recruited, of which 42(28.4%) were confirmed appendicitis. Our Appendicitis Urinary Biomarker (AuB) model incorporated urine LRG with 3 clinical predictors: 'constant pain', 'right iliac fossa tenderness', 'pain on percussion'. Area under the ROC curve for AuB was 0.82 versus 0.78 for the Pediatric Appendicitis Score (PAS) on the same cohort of patients. A model-calculated risk score of <0.15 is interpreted as low risk of appendicitis. Sensitivity for the AuB at this cutoff was 97.6%, specificity 37.7%, negative predictive value 97.6%, positive predictive value 38.3%, and negative likelihood ratio 0.06., Conclusion: The noninvasive AuB score appears promising as a diagnostic tool for excluding appendicitis in children without the need for blood sampling., Type of Study: Study of diagnostic test., Level of Evidence: Level III., (Copyright © 2018 The Authors. Published by Elsevier Inc. All rights reserved.)