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Ultrasound images. Prenatal stomach (S) position Grades 1–4, according to the grading system of Cordier et al. 14 at 20–24 weeks GA. Grade 1: abdominal, stomach not visualized in the chest. Grade 2: or anterior left in the chest. Grade 3: mid to posterior left chest. Grade 4: retrocardiac. Ultrasound images from the Erasmus University Medical Center
