Breadth: < 40 mm
Gallbladder wall: a thin hyperechoic strip

Bile duct:

< 7 mm
After cholecystectomy: the intrahepatic aspect is narrow; in the extrahepatic aspect there may be ectasia ranging to 25 mm.

Portal vein:

12 ± 2 mm
(at the hilum of the liver)

Pancreas:

Pancreatic duct (duct of Wirsung): < 2 mm

Aorta:

Suprarenal: < 25 mm
Infrarenal: < 20 mm

Vena cava:

< 20 mm; fluctuating volume

Spleen:

Length: < 140 mm
(from the cranial to the caudal pole)

Prostate:

Distance between the base and the tip: 30 – 40 mm

Uterus:

Phase of sexual maturity:
Length: 70 – 90 mm
Transverse diameter: 40 – 60 mm
Thickness: 30 – 45 mm

Ovaries:

Length: 30 – 45 mm

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