Normal Small Bowel Diameter Size on CT, MRI & X-Ray
Normal small bowel anteroposterior diameter is <3 cm in adults, with age-specific pediatric values from 13.9 mm at 6 months to ~24.9 mm at age 15.
Abdomen
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Normal Small Bowel Wall Thickness on CT and Ultrasound
Normal small bowel wall thickness is less than 3 mm on CT and ultrasound; exceeding this threshold suggests inflammation, ischemia, or neoplasm.
Normal Spleen Diameter Size by Age: Ultrasound, MRI & CT
Reference guide for normal spleen diameter by age on ultrasound, MRI, and CT—from neonates through young adults, with clinical thresholds.
Normal Splenic Vein Diameter on Ultrasound and CT
Normal splenic vein diameter measures less than 10 mm on ultrasound and CT, with normal splenic vein length under 13 cm in adults.
Normal Stomach Wall Thickness on Ultrasound and CT
Normal stomach wall thickness measures less than 10 mm on CT and ultrasound; values above this threshold warrant further evaluation for pathology.
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Normal Thorax/Abdomen Circumference Ratio on Ultrasound
Normal fetal thorax circumference to abdomen circumference ratio is >0.77 on ultrasound, a key marker for detecting thoracic dysplasia.
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Normal Umbilical Vein Diameter on Ultrasound and CT
Normal umbilical vein diameter is less than 3 mm on ultrasound and CT; values at or above this threshold suggest portal hypertension.
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Normal Vermiform Appendix Diameter: Ultrasound, CT & MRI
Normal vermiform appendix diameter is <6 mm on ultrasound and <8 mm on CT; exceeding these thresholds raises concern for acute appendicitis.
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Normal Wirsung Canal Diameter on Ultrasound
The normal Wirsung canal (main pancreatic duct) measures less than 2 mm in anteroposterior diameter on ultrasound in children.
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