Ultrasonographic reference values and a simple yet practical formula for estimating average kidney length in Japanese children

Fujita, Naoya; Uemura, Osamu; Harada, Ryuichi; Matsumura, Chieko; Sakai, Tomoyuki; Hamasaki, Yuko; Kamei, Koichi; Nishi, Kentaro; Kaneko, Tetsuji; Ishikura, Kenji; Gotoh, Yoshimitsu

doi:10.1007/s10157-022-02205-0

Cited by 7 publications

(1 citation statement)

References 13 publications

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“…Contrast‐enhanced computed tomography (CT) demonstrated bilateral lesions with heterogeneously decreased nephrographic density and a dilated left ureter (Figure 1a–c). The right kidney was enlarged to 95 mm (mean + 2.0 standard deviation), and the left kidney was atrophied to 70 mm (mean − 2.5 standard deviation) 2 . We therefore diagnosed the patient with AFBN with congenital anomalies of the kidney and urinary tract (CAKUT).…”

Section: Figurementioning

confidence: 99%

Acute focal bacterial nephritis caused by Ralstonia insidiosa in a 9‐year‐old boy

Yamamoto,

Tate,

Hotokebuchi

et al. 2023

Pediatrics International

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Ralstonia insidiosa (R. insidiosa) is a type of Ralstonia spp., which is a Gram-negative, non-fermenting bacterium. Ralstonia spp. have recently been regarded as emerging pathogens of infectious diseases, but R. insidiosa infections have rarely been reported. 1 Here, we report a case of an acute focal bacterial nephritis (AFBN) caused by R. insidiosa in a 9-year-old boy.A healthy 9-year-old Japanese boy presented to our hospital with a 2-day history of fever, vomiting, and diarrhea. He had no history of urinary tract infection (UTI) and had been vaccinated as scheduled. Physical examination revealed abdominal and bilateral costovertebral angle tenderness. Laboratory parameters were as follows: white blood cell count, 19,000/ μL; neutrophils, 89.3%; serum C-reactive protein level, 16.15 mg/dL; blood urea nitrogen level, 11.5 mg/dL; creatinine, 0.55 mg/dL (estimated Glomerular Filtration Rate, 82.47 mL/min/1.73 m 2 ); immunoglobulin G (IgG), 1608 mg/dL; immunoglobulin A (IgA), 266 mg/dL; immunoglobulin M (IgM), 227 mg/dL; C3, 186 mg/dL; C4, 30.4 mg/dL; CH50, 48 U/mL; measles IgG, 20.5(+); and measles IgM, 0.06(−). Urinalysis showed no pyuria or nitrite urine, but Gram staining of the urine showed Gram-negative rods. Chest radiograph was normal. Renal ultrasound showed an enlarged right kidney with a hyperechoic mass and reduced blood flow at the upper pole, which was suspected to be AFBN. Contrastenhanced computed tomography (CT) demonstrated bilateral lesions with heterogeneously decreased nephrographic density and a dilated left ureter (Figure 1a-c). The right kidney was enlarged to 95 mm (mean + 2.0 standard deviation), and the left kidney was atrophied to 70 mm (mean − 2.5 standard deviation). 2 We therefore diagnosed the patient with AFBN with congenital anomalies of the kidney and urinary tract (CAKUT). Intravenous ampicillin/sulbactam (150 mg/kg/day) was then administered. The patient's fever persisted, so the

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Section: Figurementioning

confidence: 99%

Acute focal bacterial nephritis caused by Ralstonia insidiosa in a 9‐year‐old boy

Yamamoto,

Tate,

Hotokebuchi

et al. 2023

Pediatrics International

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A case of tubulointerstitial nephritis mimicking acute focal bacterial nephritis. Lesson for the clinical nephrologist

Mikami,

Sasaki,

Hashimoto

et al. 2023

J Nephrol

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Increased kidney length in mild urinary tract dilatation is a significant prognostic factor for non-resolution

Ishimori,

Fujimura,

Nishiyama

et al. 2024

Preprint

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Purpose Even asymptomatic and mild urinary tract dilatation (UTD) that does not resolve may harbor the potential for progression of the severity of UTD, which suggests the need for continued observation. However, no studies have investigated factors contributing to the persistence or non-resolution of mild UTD. Materials and Methods We conducted a prospective cohort study of children who were newly diagnosed with mild UTD during the neonatal period from 2013 to 2021. They were evaluated by periodic kidney ultrasound until 3 years old. Sonographic reference values of kidney length were evaluated according to estimation formulas, and sonographic kidney volume was calculated using kidney length, width, and depth. Results This study included 33 children with mild UTD, which involved 58 kidney units. These units were graded as UTD P1 in 23 and UTD P2 in 35 units. Sonographic kidney length and volume were significantly higher in kidneys with UTD P2 that did not resolve during 3 years than in those that resolved at 3, 6 months and 1 year. The time to resolution of UTD P2 in kidneys with a length > 0.7 standard deviations at 3 months and > 1.2 standard deviations at 6 months was significantly longer than that in kidneys with a length ≤ 0.7 standard deviations at 3 months (p < 0.01) and ≤ 1.2 standard deviations at 6months (p = 0.01). Conclusions Increased sonographic kidney length in UTD P2 is a prognostic factor for non-resolution of kidney pelvic dilatation. Trial Registration UMIN Clinical Trial Registry: UMIN 000013286 (https://center6.umin.ac.jp/cgi-open-bin/ctr/ctr_view.cgi?recptno=R000015493), with the registration date of February 26, 2014.

show abstract

Ultrasonographic reference values and a simple yet practical formula for estimating average kidney length in Japanese children

Cited by 7 publications

References 13 publications

Acute focal bacterial nephritis caused by Ralstonia insidiosa in a 9‐year‐old boy

Acute focal bacterial nephritis caused by Ralstonia insidiosa in a 9‐year‐old boy

A case of tubulointerstitial nephritis mimicking acute focal bacterial nephritis. Lesson for the clinical nephrologist

Increased kidney length in mild urinary tract dilatation is a significant prognostic factor for non-resolution

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