Legend: Ao: aorta; L: liver; P: pancreas; Sma: superior mesenteric artery; yellow arrows: antrum

Legend: IVC: inferior vena cava; L: liver; P: pancreas; yellow arrows: fluid filled antrum


  • The empty antrum can be identified in ≥ 90 % of severely obese individuals at an average depth of 7 cm
  • Compared to non-obese subjects, obese individuals present:
    • Larger antral CSA and absolute fasting gastric volume
    • Similar fasting gastric volume per unit of weight
  • The mathematical Perlas model has been validated in subjects with BMI ≥ 40 kg/m²