Types

 duodenal mucosal atresia (duodenal membranous atresia) by mucosal diaphragm (web)
 blind ends duodenal atresia

• blind ends separated by a fibrous cord
• blind ends separated by a V-shaped mesenteric defect
• blind ends with apple peel appearance
• multiple atresia (string of suasages appearance)

Etiology

 familial duodenal atresia (MIM.223400)
 syndromic duodenal atresia

• Down syndrome (MIM.190685)
• oculodigitoesophagoduodenal syndrome (MIM.164280)
• Fryns syndrome (MIM.229850)
• Townes-Brocks syndrome (TBS) (MIM.107480)
• Miller-Dieker lissencephaly syndrome (MIM.247200)

Associations

 complex intestinal malformations

• apple peel small bowel syndrome (MIM.243600)
• familial intestinal polyatresia syndrome (FIPA) (MIM.243150).
• duodenojejunal atresia associated with malrotation, volvulus, absent dorsal mesentery (absent parietal attachment of the mesentery) and absent superior mesenteric artery (MIM.606894)