The most common cause of non-duodenal<unk>  is a vascular accident in utero that leads to decreased intestinal perfusion and ischemia of the respective segment of bowel. This leads to narrowing, or in the most severe cases, complete obliteration of the intestinal lumen. In the case that the superior mesenteric artery, or another major intestinal artery, is occluded, large segments of bowel can be entirely underdeveloped (Type III). Classically, the affected area of bowel assumes a spiral configuration and is described to have an "apple peel" like appearance; this is accompanied by lack of a dorsal mesentery (Type IIIb). An inherited form – familial multiple<unk>  – has also been described. This disorder was first reported in 1971. It is due to a mutation in the gene TTC7A on short arm of chromosome 2 (2p16). It is inherited as an autosomal recessive gene and is usually fatal in infancy. Ileal atresia can also result as a complication of meconium ileus. A third of infants with<unk>  are born prematurely or with low birth weight.
Intestinal atresia
Gastric atresia
Duodenal atresia
Gastroschisis
Choanal atresia
Situs inversus
Familial multiple intestinal atresia
Atresia