Our results showed that urolithiasis in infants may present nonspecific symptoms and may even be asymptomatic and that a positive family history for urolithiasis, urologic abnormalities, metabolic disorders, urinary tract infections, vitamin D administration and feeding with formula may increase the occurrence of urolithiasis in infants.

The study aims to present the incidence of COVID-19 in pediatric patients undergoing renal replacement therapy (RRT) and to compare the severity and outcomes of the disease between the dialysis and kidney transplant (KTx) groups. This multicenter observational study was conducted between 1 April and 31 December 2020 in Istanbul. Members of the Istanbul branch of the Turkish Pediatric Nephrology Association were asked to report all confirmed cases of COVID-19 who were on RRT, as well as the number of prevalent RRT patients under the age of 20. A total of 46 confirmed cases of COVID-19 were reported from 12 centers, of which 17 were dialysis patients, and 29 were KTx recipients. Thus, the incidence rate of COVID-19 was 9.3% among dialysis patients and 9.2% among KTx recipients over a 9-month period in Istanbul. Twelve KTx recipients and three dialysis patients were asymptomatic ( p = 0.12). Most of the symptomatic patients in both the dialysis and KTx groups had a mild respiratory illness. Only two patients, one in each group, experienced a severe disease course, and only one hemodialysis patient had a critical illness that required mechanical ventilation. In the entire cohort, one hemodialysis patient with multiple comorbidities died. Conclusion : While most cases are asymptomatic or have a mild disease course, pediatric patients undergoing dialysis and a kidney transplant are at increased risk for COVID-19. What is Known: • In adult population, both dialysis patients and kidney transplant recipients are at increased risk for severe illness of COVID-19 and have higher mortality rate. • Children with kidney transplantation are not at increased risk for COVID-19 and most have mild disease course. • Data on children on dialysis are scarce. What is New: • Pediatric patients undergoing dialysis and kidney transplantation have an increased risk for COVID-19. • Most patients undergoing renal replacement therapy either on dialysis or transplanted develop asymptomatic or mild COVID-19 disease with a favorable outcome.

Our results suggest that endothelial damage starts in the early stage of childhood obesity and that obese and overweight children have increased circulating CD144+EMPs, showing that endothelial dysfunction and increased CD144+EMPs may be related to obesity.

The PUF-C group had a high permeability UFF. These results showed that MSC transplantation exerted positive effects on UFF in a chronic rat model of PD. MSC transplantation may provide new options for the renewal of the peritoneum in chronic PD patients with UFF.

Primary cutaneous mucormycosis (MM) is a rare fungal infection of childhood and is most often encountered in immunocompromised patients. It is a potentially lethal opportunistic fungal infection with rapid progression and high mortality. A report of cutaneous MM involving the head region is very rare. We herein report a case of primary cutaneous MM in a malnourished patient. The infection progressed rapidly, and the infant died from infection. The diagnosis was made at postmortem examination. Early diagnosis and surgery should be undertaken to prevent fatal outcome, and complete study of the etiologic agent must be carried out in all cases.

Aim: The purpose of this study was to determine the effect of mesenchymal stem cell (MSC) transplantation on the peritoneal morphology and inflammation markers in rat models of peritoneal dialysis (PD). Materials and methods: Wistar albino rats were divided into two groups: control (C) (n ¼ 8) and experimental groups (n ¼ 50). PD solution was given to the experimental group during 6 weeks. Then, experimental group was divided into three groups as PD, MSC, and placebo (P) groups. MSC group was treated with MSC (1.5 Â 10 6 cells/kg) and P group was treated with phosphate buffer solution via intraperitoneal injection. Evaluation was performed to C and PD groups at the end of 6 weeks and to MSC and P groups at second and third week of the treatment (MSC-2, P-2, MSC-3, and P-3 groups). Results: The submesothelial area was significantly thickened in PD and P groups compared to C and MSC groups. Peritoneal fibrosis was seen in P-3 group but not in MSC group. There were no significant differences between the MSC-3 and C groups according to morphological findings. Levels of tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6) were significantly increased in MSC-2 group compared to the other groups (p-values ranged from 0.0001 to 0.04). TNF-α and IL-6 levels in MSC-3 and P-3 groups were lower than PD and C groups (p < 0.0001 for TNF-α and p ¼ 0.0001-0.002 for IL-6). Conclusion: Giving MSC may protect the peritoneal membrane from the deleterious effect of PD and extend the life of the peritoneal membrane. Our study is the first on this issue and more detailed studies are needed.

Congenital nephrotic syndrome is a rare clinical entity defined as massive proteinuria leading to symptoms within the infant's first 3 months of life. Although the association between congenital nephrotic syndrome and cytomegalovirus infection has been identified, association with haemophagocytosis has not been reported in the literature. In this case report we describe concomitant cytomegalovirus infection and haemophagocytosis in a 3-month-old girl with congenital nephrotic syndrome.

Our results suggest that endothelial damage is present especially in the active period of the disease in children with FMF. The endothelial dysfunction becomes an overt parallel with inflammation.