An abnormal opening in the diaphragm that allows part of the abdominal organs to migrate into the chest cavity, occurring before birth.
Review Date 4/28/2023
Updated by: Neil K. Kaneshiro, MD, MHA, Clinical Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.