RT Book, Section A1 Klinkner, Denise B. A1 Gourlay, David M. A2 Rudolph, Colin D. A2 Rudolph, Abraham M. A2 Lister, George E. A2 First, Lewis R. A2 Gershon, Anne A. SR Print(0) ID 7036744 T1 Chapter 402. Omphalo-Mesenteric Duct Remnants 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=7036744 RD 2024/10/07 AB An “unusual” diverticulum of the small intestine was first described by Fabricius Hildanus in 1598, but Johannes Meckel wrote the first definitive description of the Meckel diverticulum in 1809. The vitelline (or omphalo-mesenteric) connects the yolk sac to the primitive gut. It normally involutes by the ninth week of gestation, but persistence of all or portions of this duct can result in a Meckel diverticulum or other abnormalities of the omphalomesenteric duct, such as omphalomesenteric fistula, omphalomesenteric cyst, umbilical sinus, or mesodiverticular bands.1