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".
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Epidemiology
Gastric antral webs are rare. There is an association with trisomy 21 and immunodeficiency syndromes.
Radiographic features
Fluoroscopy
- 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"
Treatment and prognosis
The web may lead to gastric outlet obstruction. Symptomatic webs may be removed with upper endoscopy 3.
Differential diagnosis
- 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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