Gastric antral web

Last revised by Mohammad Taghi Niknejad on 24 May 2024

Gastric antral webs are a ring of mucosa in the distal stomach (gastric antrum) that can lead to gastric outlet obstruction. A circumferential ring of mucosa has also been termed a "gastric antral diaphragm".

Gastric antral webs are rare. There is an association with trisomy 21 and immunodeficiency syndromes.

  • smooth, thin narrowing of the gastric antrum, ~2 cm from the pylorus
  • if the web is large, it may result in the appearance of a "double duodenum"

The web may lead to gastric outlet obstruction. Symptomatic webs may be removed with upper endoscopy 3.

  • gastric carcinoma
  • pyloric stenosis (longer channel length than a web)
  • distal gastrospasm 4
  • redundant gastric mucosa 4
  • hypertrophic gastric rugae 4
  • heterotrophic pancreatic tissue 4
  • cholecystogastrocolic bands 4
  • perigastric adhesions 4

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