Fasted state: Empty gastric antrum

The antrum has a small hypoechoic cavity with very little fluid and no solid material or air. The walls of the antrum appear thick and non-distended. This is the appearance in the fasted state.

R: rectus abdominis muscle; L: liver; A: antrum; P: pancreas; SMA: superior mesenteric artery; D: diaphragm; AO: aorta.

Reproduced with permission from: Van de Putte P, Perlas A. Image Acquisition: Scanning Technique. Gastric Ultrasound. Copyright © 2018. Available at: https://gastricultrasound.org (Accessed on June 29, 2018).

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Fasted state: Empty gastric antrum