Diagnostic Ultrasound - Abdomen and Pelvis

Bowel
Anatomy: Abdomen
GASTRODUODENAL REGION/DUODENUM
Subcutaneous adipose tissue
Abdominal wall musculature
Left lobe of liver
Pylorus
Duodenal bulb (D1)
Inferior vena cava
Pancreas
Aorta
Abdominal wall
Gastric antrum
Superior mesenteric vein
Uncinate process of pancreas
D3
D2/D3 junction
Inferior vena cava
Superior mesenteric artery
D3/D4 junction
Aorta
Abdominal wall
3rd part of duodenum (D3)
Inferior mesenteric artery origin
Aorta
Inferior vena cava
(Top) Transverse oblique ultrasound through the epigastric region shows the pylorus with the hypoechoic prominent muscular wall
leading to the duodenal bulb. (Middle) Transverse ultrasound through the upper abdomen shows the gastric antrum anteriorly
compressed by the curvilinear probe and collapsed 3rd part of the duodenum (D3) posteriorly. The SMA and the superior mesenteric
vein (SMV) are seen in the plane in between. The inferior vena cava (IVC) and aorta are seen posterior to the D3. (Bottom) Axial midline
high-resolution ultrasound through the upper abdomen shows fluid distended in the D3 located across, in the upper retroperitoneum.
Note the aorta and IVC posterior to the D3. Gut signature is seen in the wall of the D3.
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