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Hypertrophic pyloric stenosis: tips and tricks for ultrasound diagnosis

Sílvia Costa Dias1, Sophie Swinson, Helena Torrão

  • 1Radiology Department, Hospital de Braga, Braga, Portugal, silviacostadias@hotmail.com.

Insights Into Imaging
|June 15, 2012
PubMed

Insights

Ultrasound is key for diagnosing hypertrophic pyloric stenosis (HPS) in infants. This guide details the systematic ultrasound examination of the pyloric canal, defining diagnostic criteria for HPS.

Area of Science:

  • Pediatric Radiology
  • Gastrointestinal Imaging
  • Medical Ultrasound

Background:

  • Hypertrophic pyloric stenosis (HPS) is a common cause of non-bilious vomiting in infants.
  • Ultrasound is the preferred imaging modality for diagnosing HPS due to its safety and efficacy.

Purpose of the Study:

  • To describe a systematic approach to ultrasound examination of the antropyloric region in children.
  • To review and illustrate the imaging features of normal pylorus and diagnostic findings in HPS.
  • To discuss common difficulties and provide tips for overcoming them during the examination.

Main Methods:

  • Systematic ultrasound examination of the antropyloric region.
  • Review of imaging features for normal pylorus and HPS.
  • Pictorial essay format with illustrations.

Main Results:

  • Hypertrophic pyloric stenosis is characterized by muscular layer thickening and pyloric canal non-relaxation.
  • The primary diagnostic criterion for HPS is a pyloric muscle thickness exceeding 3 mm.
  • Abnormal pyloric canal elongation is defined as a length greater than 12 mm.

Conclusions:

  • A systematic ultrasound approach facilitates accurate diagnosis of HPS in children.
  • Understanding key measurements (muscle thickness and canal length) is crucial for HPS diagnosis.
  • This pictorial essay serves as a guide for performing and interpreting pediatric pyloric ultrasound.

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