Transient ultrasonographic keyboard sign and to-and-fro movement at the onset of childhood nephrotic syndrome

The ‘keyboard sign’ refers to prominent Kerckring folds (circular folds) in a fluid-distended small bowel, unlike normal bowel. The ‘to-and-fro movement’ is bidirectional intraluminal flow due to impaired peristalsis. Both are characteristic ultrasonographic findings of small bowel

Authors

Mizue Tsukui
Shinya Kawaguchi (ORCID: https://orcid.org/0000-0002-7038-7955)
Yuhi Takagi (ORCID: https://orcid.org/0000-0003-0346-0611)
Makoto Ishikawa
Hideaki Shiraishi (ORCID: https://orcid.org/0000-0003-4199-0728)
Sonoe Kaneko
Momoko Kubo
Kohei Kato
Junya Shindo

Institutions

Ashikaga Red Cross Hospital (JP)
Dokkyo Medical University (JP)

Publication Details

Journal: BMJ Case Reports
Published: 2026-11-01
DOI: https://doi.org/10.1136/bcr-2026-277285
Primary Topic: Ultrasound in Clinical Applications
Type: article
Field-Weighted Citation Impact: 0.00

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article

Transient ultrasonographic keyboard sign and to-and-fro movement at the onset of childhood nephrotic syndrome

Mizue Tsukui, Shinya Kawaguchi, Yuhi Takagi, Makoto Ishikawa et al.

Nov 1, 2026

BMJ Case Reports

Ultrasound in Clinical Applications

article

Transient ultrasonographic keyboard sign and to-and-fro movement at the onset of childhood nephrotic syndrome

Mizue Tsukui, Shinya Kawaguchi, Yuhi Takagi, Makoto Ishikawa, Hideaki Shiraishi, Sonoe Kaneko, Momoko Kubo, Kohei Kato, Junya Shindo

November 1, 2026article en

Abstract

The ‘keyboard sign’ refers to prominent Kerckring folds (circular folds) in a fluid-distended small bowel, unlike normal bowel. The ‘to-and-fro movement’ is bidirectional intraluminal flow due to impaired peristalsis. Both are characteristic ultrasonographic findings of small bowel

BMJ Case ReportsVol. 19(11)

Ashikaga Red Cross Hospital (JP), Dokkyo Medical University (JP)

Openalex Percentile: Top 11%

Ultrasound in Clinical Applications

DOI Source OpenAlex

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