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The post-reduction donut sign

W Rohrschneider1, J Tröger, B Betsch

  • 1Department of Pediatric Radiology, University of Heidelberg, Germany.

Pediatric Radiology
|January 1, 1994
PubMed
Summary
This summary is machine-generated.

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A post-reduction "donut" sign in ultrasound after intussusception treatment is common and differs from recurrent intussusception. This finding, likely ileocecal valve edema, resolves within five days.

Area of Science:

  • Pediatric Radiology
  • Gastrointestinal Imaging
  • Abdominal Ultrasound

Background:

  • Intussusception is a common surgical emergency in children.
  • Post-reduction imaging can present diagnostic challenges.
  • Differentiating residual intussusception from normal post-procedural findings is crucial.

Purpose of the Study:

  • To describe the sonographic appearance of the post-reduction "donut" sign.
  • To establish criteria for differentiating this sign from recurrent intussusception.
  • To determine the natural resolution of this finding.

Main Methods:

  • Abdominal ultrasound examinations were performed on 30 children after successful nonoperative reduction of ileocolic intussusception.
  • Ultrasound findings were correlated with clinical and radiological success criteria.

Related Experiment Videos

  • Key sonographic features of the "donut" sign were analyzed and compared to the initial intussusception target sign.

    • Main Results:

    • Over half of the patients exhibited an aperistaltic "donut" sign in the ileocecal region post-reduction.
    • The "donut" sign was distinguished from the intussusception target sign by its smaller diameter and distinct echographic pattern (hypoechoic rim, echogenic center).
    • Localized distal ileal wall thickening was noted in one-third of patients without diagnostic issues; all suspicious findings resolved within 5 days.

    Conclusions:

    • The post-reduction "donut" sign is a common, transient finding after intussusception reduction.
    • It represents ileocecal valve edema rather than mechanical obstruction or residual intussusception.
    • Ultrasound criteria can reliably differentiate this benign finding from pathological recurrence.