Duodenal web

A duodenal web, diaphragm or intraluminal diverticulum refers to a complete or incomplete obstruction at the duodenum due to a membranous web or intraluminal diverticulum. There is usually a small aperture at the centre differentiating this from a duodenal atresia

Although they are frequently congenital and occur in the paediatric population, some can can present in adults 3-4  and may also be acquired 3. The presentation can be variable depending on the size of the aperture. 


They have a tendency to occur at the 2nd part of the duodenum 1 .


Radiographic features 

Abdominal radiograph

If severely obstructive may show a double bubble sign.

  • may show a dilated stomach and proximal duodenum. 
  • may how a hypoechoic intraluminal diverticulum

Can typically give a "windsock sign" (gradual ballooning of the duodenal diaphragm) or "halo sign" due to the web projecting caudally into the duodenal lumen.

Differential diagnosis

Imaging differential considerations include

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Article Information

rID: 7630
Synonyms or Alternate Spellings:
  • Intraluminal duodenal diverticulum
  • Duodenal diaphragm
  • Duodenal webs
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    Case 1
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    Case 2
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    Duodenal web
    Case 3
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    Case 4: intraluminal duodenal diverticulum (windsock sign)
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