TY - CHAP M1 - Book, Section TI - Intestinal Malrotation with Volvulus A1 - Shah, Ashish A1 - Sobolewski, Brad A1 - Mittiga, Matthew R. A2 - Knoop, Kevin J. A2 - Stack, Lawrence B. A2 - Storrow, Alan B. A2 - Thurman, R. Jason PY - 2021 T2 - The Atlas of Emergency Medicine, 5e AB - Intestinal malrotation with volvulus is primarily a condition of infancy but can be seen in older children and adults. During week 4 of embryonic development, the primary intestinal loop bulges into the yolk sac and rotates 270 degrees counterclockwise. Between weeks 8 and 10, it returns to the enlarged abdominal cavity and is fixed via mesentery that extends from the ligament of Treitz to the ileocecal valve in the right lower quadrant. In malrotation, the duodenum, jejunum, and cecum are partially rotated with the bowel anchored by an abnormally thin band of mesentery. The bowel can twist on this thin mesentery, which contains the superior mesenteric artery, leading to acute intestinal obstruction and midgut vascular compromise known as volvulus. Also, the abnormally positioned cecum now rests in the upper abdomen fixed to the right lateral abdominal wall by bands of peritoneum (Ladd bands) that cross and can obstruct the duodenum. SN - PB - McGraw-Hill CY - New York, NY Y2 - 2024/03/29 UR - accessmedicine.mhmedical.com/content.aspx?aid=1181044314 ER -