RT Book, Section A1 Winthrop, Andrea A1 Whitehouse, Jill A2 Rudolph, Colin D. A2 Rudolph, Abraham M. A2 Lister, George E. A2 First, Lewis R. A2 Gershon, Anne A. SR Print(0) ID 7036635 T1 Chapter 399. Congenital Atresias, Stenosis, and Webs T2 Rudolph's Pediatrics, 22e YR 2011 FD 2011 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-149723-7 LK accesspediatrics.mhmedical.com/content.aspx?aid=7036635 RD 2024/03/28 AB Congenital intestinal atresias, stenosis, and webs typically present early in neonatal life due to the associated obstructive symptoms. The reported incidence varies from 1 to 2 in 5000 births in the United States. These malformations can occur throughout the intestinal tract, but are most commonly found in the duodenum (50%) and the jejunum or ileum (35–40%). A colonic location is identified in 5% to 10% of atresias, and rarely, pyloric or gastric lesions are present (< 1%).1